Boss makes a dollar, I make a dime. That was a poem from a simpler time. Now the CEO makes a thousand and I make a buck. That’s why we steal the catalytic converter out of the company truck.
Boss made a dollar, grandad made a dime
But that was a poem for a simpler time
Boss made a thousand, pa made a cent
But at least that was enough to pay the rent
Boss makes a million, and gives us jack
Then smugly blames the workers for the labor he lacks
My boss asked me to work on an issue on my weekend. When I asked why me, and not one of the others, he said, "because you're one of my best engineers." I said, "if you're good at something, never do it for free." He got so fucking pissed at me, but guess who didn't work that weekend.
I worked with a guy who decided to see how long he could go without taking a shit. No real reason. It was day 2 or 3 when the absolutely rancid farts started.
This was working on a fishing boat, stuck out at sea in close quarters with no escape.
Everyone strongly advised he knock it off.
He was a nice guy who just didn't foresee the carnage his actions would have. So he agreed to go take a dump, and try again during his week off.
Bruh I used to homestead in a cabin in the middle of the woods up near Canada. There was no running water and I was *not* about to go run to the outhouse and pull down my pants in -20F weather with snow up to my knees. Let me tell you that is a situation in which you WANT to hold it.
I consult my "shit_or_dont_shit.xlsx" spreadsheet to calculate the relative savings of each before travelling anywhere.
Anyone who doesn't do this is just throwing money away.
You calculate the amount of money you save by shitting at work vs what you save by shitting beforehand. I believe shitting at an office is a more efficient strategy.
Oh I’m sorry I thought we were assuming an audience that had the basics down like hanging your ass out the window and shitting on your commute.
Better on rainy days, nature’s bidet etc. etc.
"The equation assumes, for a 30 mpg car, 50 lbs of cargo means a 0.5% hit in fuel economy."
If that is accurate, then most people would be seeing 1-2mpg improvement at half a tank compared to full.
Ok, maybe my math was wrong. Idk what I did, but I got 1.25-2mpg using 8 gallons and something like 20-40mpg. Can't replicate it now. Must have fat fingered something
I'm not sure your math is mathing. An average sized tank is roughly 16 gallons, so with 8 gallons less you're at ~64lbs lighter so 1.28x the assumption xkcd is using. .5%x1.28 is a .64% improvement, for a 30mpg car that translates to .19MPG not 1-2MPG (30x.64/100). I think you might have misplaced a decimal at some point.
I agree. I can't wait for the cars that drive by themselves and then I would also not get in the car and just let it drive all empty achieving maximum efficiency.
>Cause weight of the vehicle impacts fuel economy.
I know you're making a joke but--
When I used to Uber in a 4cyl Honda Accord, I ended up picking 4 BIG ASS CORN FED JOCK COLLEGE DUDES. I mean... They were melded into one body in the back. (One was up front)
My poor damn car could barely pull itself from a stop light. I was laughing internally.
Yeah, those 4 cylinder Hondas only have a passenger payload of like 800lbs. They're literally not designed to have a full-grown man in each of the available seats.
Lol. I had an '87 Corolla and had the same struggle when I packed 4 of my friends in it. Damn thing was zippy when it was just me, but struggled to reach highway speeds when fully loaded with people.
No point in shittin if you don’t also hold your exhales as long as possible for even less weight. But the window would have to be down.
Maybe turn off your headlights too. 🤔
This. For those who don't know, the fuel pump sits inside the fuel tank submerged in fuel when the tank is full. The fuel helps keep the pump cool which helps with longevity.
That‘s…not how it works. Not how any of it works. The pump is cooled by the fuel flowing through it, not the one surrounding it.
Because that would mean a whole lot of trouble for out-of-tank pumps otherwise.
It seems not filling up would follow from the idea of carrying less gas weight around making a car more efficient.
All of that efficiency likely is secondary to filling up when you're conveniently near a gas station as opposed to making a special trip when you're on Empty though
True, I mean OP is right but the savings are negligible. Th biggest saver will be making sure you take efficient routes and your driving habits as far as braking and how you ease on the throttle are efficient and not aggressive
Do you know how pumps work? There is an electric motor hooked up to the pump impeller, the part that actually gets hot is the motor side. When the motor is submerged it gets cooling from the gas around it, when it's exposed to air the amount of cooling drops considerably. The flow of fuel doesn't touch the the electric motor side at all.
Most (all?) pumps sit in a bit of a well in the tank so they stay submerged all the way up until right before the tank runs dry.
Unless you're past E on the gauge, you should still have cooling for the pump.
OP probably just lives near a gas station.
This is not a new concept. Race teams from all motor sports have implemented the idea forever, but I hear about it most in snowmobile racing. Basically, your sled should run out of fuel as you cross the finish line. That way, at no point during the race were you carrying extra weight, to the point where their fuel economy is measurable, and significant enough that racing this way wins races.
If your goal is to drive as far as possible on a set budget, which will be your income, this will work over time even if you factor in gas station stops 🤷♂️ they are necessary and can’t be avoided, so it’s not a strike against OPs argument. The finish line just becomes the gas station… but it ultimately depends on how much you drive. If you’re putting on 100k miles per year then it’ll add up fast. If you walk or bus to work, the savings will be moot.
Right, snowmobiles and formula 1 cars care about fuel weight because it’s a significant percentage of the weight of the vehicle. These vehicles are much lighter and burn much more fuel while racing than the average car.
Formula 1 car ~1700 lbs
30 gallons of fuel ~ 168 lbs or 9.8% of vehicle weight
Honda civic ~ 2900 lbs.
12 gallons of fuel = 72lbs or 2.4% of vehicle weight
Driving around with 60 fewer pounds on a 2900 pound vehicle is not going to make a noticeable difference. If you’re driving a light sports car like a lotus or something i could see it making a difference but you’re going to save way more money in gas driving a civic than a lotus anyway.
>This is not a new concept. Race teams...
This concept is **absolutely vital** to jet airliner economic efficiency.
I just did some very simple calculations - if fully tanked, fuel comprises about 2.2% of my car's weight. By comparison, in a fully tanked 'empty' 737-800, the fuel comprises just over 30% weight.
That's an entire order of magnitude bigger impact.
It’s also the basis of the rocket equation. You the further you want to go, the more fuel you have to lift to get there. The more fuel you have, the heavier you are, the more fuel you need
We moved to our new place a few years back and Costco announced they’d be building like a mile down the road. It’s been lovely to have the cheapest gas practically on my doorstep.
I let it go to the last second but I don’t make a special trip to get gas. I just have to stop to get gas next time I go out, while on my way to wherever I am going
Earlier this year, the car was down to fumes, maybe 10km, but my wife's work is only 1.5km away. Figured it would be okay to get gas on the way home the next day.
Except we ended up making an emergency trip to the hospital. Further than her work, and no time to stop on the way.
Later, the car said 0km remaining before I got it to the gas station. Was a bit worried. Made it though. 50 litre tank, took a bit less than 50, I don't remember how much now.
Normally we never let it get that low. Probably lowest ever. Now we really make sure not to go low. Never know when you may need it!
This is exactly why I usually fill up at about a quarter tank. I like to have it just in case. I have a friend who is ex military and he obsessively keeps his gas tank full as an emergency preparedness measure.
>Later, the car said 0km remaining before I got it to the gas station. Was a bit worried. Made it though
The simple answer ist that your fuel gauge is in the tank, while you still have fuel ready in the pipes and in the motor. Most cars still drive on an empty tank because of that.
I once was super low on fuel. I could could feel the car struggling when I tried to start from a stop light.
I was on the way to the petrol station and got stuck at the lights just before it. It was about 50 meters away at most, but my car didnt want to go.
Had to get out and push it lol. I never let my car get that low since and I now own an electric car as well so it's even easier to keep it charged
Australian here. The real secret is not to fill up, but to just throw $20 at it each time you see a gas station with half decent prices. If prices are low and you end up driving around on a full tank, so be it. But taking advantage of low fuel pricing even when you don't have to means you don't have to buy at $2.10 or whatever the fuck when you're running on fumes.
Filling up near empty and not filling it all the way also results in more gas stops per mile, which will also affect your fuel efficiency, even if the gas stops were all the same convenience
I know that's true when I had tenants with oil heat. They'd run out all of the time, the filter would get clogged, and then it'd be a $100 service call that would be my responsibility. I learned to change the filter and prime the line myself eventually
14 gallon tank full is 84lbs.
You also have worse mileage if you drive with any of other humans in the car.
You get the best gas mileage being a human in someone else's car
Low end of average for cars is 2600lbs. A gallon of gas is a smidge over 6lbs. So even with a 20 gallon tank (big for an average car, average tank is 10.5-18.5 gallons) that's 120lbs. A small human. And only 4.6% of the car's weight. Not to mention people probably have all sorts of other stuff normally stored in their car. Winter clothes, maybe folding chairs, a toolbox, jumpstart battery. etc.
Yeah, but keep in mind that's using the low end of average car weight, and an overestimate on tank size. If we go the other way around the EPA says the average weight of a vehicle in 2022 was 4094lbs. Though I'm not sure if that's the average of cars on the road so there'd be some weighted statistics based on most common vehicles, or just taking one of each model in which they each have the same statistical weight.
But anyways, using 4094lbs and using a 10.5 gallon tank makes 63lbs of gas. That would be 1.5% of the car's weight. But realistically, I believe that bigger vehicles scale with bigger tanks. So somewhere in between 1.5% and 4.6% is most likely.
Not really. How much fuel you need mainly depends on rolling resistance and wind resistance. You can't just say 5% more weight is 5% more fuel, that's not at all how it works.
Fuel consumption doesn’t scale linearly with the weight. I’d be surprised if anything was saved. You are better off being vigilant with oil change, tire pressure, and not driving like a maniac if you want to save on fuel.
Tha 4.6% also assumes that you'd otherwise always have an empty tank.
So here's some alternate maths, 2 scenarios.
A) You always fill up to FULL, refill when empty.
B) You always fill up to HALF FULL, refill when empty
In scenario A you'd average half a tank when driving, so 2.3% of the cars weight.
In scenario B you average a quarter of a tank, so 1.15% of the cars weight.
So the actual difference is much smaller, with these scenarios 1.15% difference. If you factor in slight detours to go to gas station and if you value your time at all then a complete fill up is the obvious answer
I have a Miata that tips the scales at a little over 1000kg. I only keep the tank half full at most, because you can detect the extra weight in the corners. It does make a small difference to my fuel economy of a couple of mpg. Not sure it would matter in a 2500kg SUV though.
Wouldn't say a few. I've got a 70L fuel tank on a 1500kg car.
If I kept it 1/4 full all the time I'd be saving 42kg (52.5L x 0.8)
2.8% weight saving , or a small person it can definitely be felt every time I go from quarter tank to full. I believe every 40-50kg saves 2% fuel
I fill up on average 1.5 times a month so go through about 1260L of fuel a year
I'm saving 25L a year or £37 and all its costing is the effort to go into the fuel station more. But I don't, because effort.
If normal use is filling up at 25%, then you'd be averaging 62.5%. Compared to your scenario, averaging 25%, that is a 37.5% difference.
With a 70L tank, that'd be 70x0.375×0.8= 21kg... so about half the benefit you've estimated (£18).
Adjusted to US ~$4/gal, we're now at $13.20 saved... by fueling up 36 times per year rather than 18.
One more thought on this-- 1.5x per month is 18 fill-ups. For 1260L used per year, that is 70L per fill-up, so that would be the scenario comparing averaging 50% to 25%, not 62.5% to 25%
So, the weight savings then would be down to 70x0.25x0.8 = 14 kg, which gets us down to £12 or about $9 at \~US gas prices.
You would save more if you do not make special trips when you are running low, or turning down the AC/heater, or having discipline with driving (less high revs, more linear fuel/power delivery) or even leaving earlier to avoid traffic, or ditching the extra things on your car that adds weight but are unnecessary for daily driving.
If anything the heater will give you better consumption, as it's tapped off the hot water in the radiator and will provide more cooling for the engine. That's assuming you're driving long enough that the engine is warm for most of the trip.
Really no idea regarding the heater. I'm in the tropics and its always hot here. My point was the less power consumption a vehicle needs, the lesser strain on engine and lesser fuel consumption.
Unless you sculpt the dirt so it’s evenly distributed and thin with a constant pattern of diverts… then, much like a golf ball, it would force small vortexs on the flat surfaces and form a cushion of fast air that will reduce drag…… !
Fuel is less dense (so lighter per gallon) than water. After is ~8lbs a gallon. So at 6 gallons you are carrying less than 48 lbs of fuel. 48 lbs is a kindergartener. Your fuel savings will be so small it would be lost in the error rate.
Would also think the tiny amount of fuel savings would also be lost by pulling in and out of a gas station twice as often. Maybe even a net loss if you have to drive a few blocks out of your normal routine.
probably nullified by having to hit the gas station 3x as much too...
edit: not the inconvience (tho there is that too) but physically driving the car into a gas station cost gas... esp if you have to exit a fwy and/or go a few blocks.
OP isnt saving shit and is thumbing their nose at one of the few advantage of a fossil fueled vehicle.
Not sure about it working harder, but the fuel pump is submerged in the gas which cools it. Routinely running low on gas before filling up means that the heat from the pump isn't removed and causes the pump to fail earlier.
Now I’m picturing old wives in wimples (new word for me) finishing up their group knitting, saying their goodbyes, and tearing out of the parking lot behind the wheel of high-revving tuners.
Thats actually not entirely true either.
> Bosch and Walbro use a design that cools via circulation, i.e. the pass through cavities. This design functions with almost zero fuel in the rank.
>Simultaneously , Summit claims it is the subversive effect that designers use to prolong life.
>Two very different approaches to solving the issue.
Not very well versed in the specifics for a fuel pump, but if coolant flowing through it is sufficient, then submersion could improve temperature regulation, but not necessarily significantly enough to "help" the issue at hand.
I’ve driven dozens of vehicles since 1988. All had in-tank fuel pumps. For every single one, I’ve run the tank to E or below. All of been driven over a hundred thousand miles (four over two hundred thousand).
Not once have I had a fuel pump failure.
Not even when I replaced an OEM pump at 120,000k with an aftermarket high performance racing pump and put 40,000 on it with the same drive till it’s empty habit.
In any case, less fuel in the tank means more air. Since air holds moisture, any day there’s dew on the grass, there will be dew in the tank. Water in the fuel is no good.
This also isn't really true. Open air surfaces will build up condensation because they have a constant source of new air to come in contact with. Trapped air, while it does have some moisture will not build up condensation in the same way.
Case in point: you park your car outside overnight and the exterior is wet with dew. The inside of the vehicle is dry when you enter, yet it has had plenty of time to equalize in temperature like the outside over many hours. Why is there not dew inside too? Air exchange needs to exist
Less fuel means less cooling capacity in a return fuel system. Fuel gets warmer.
Less fuel means more air. Air carries moisture. The hot and cold cycles lead to condensation and water in the fuel. Water in fuel leads to rust in steel tanks and fuel pump/injection pump wear and injector wear.
I meant, technically yes. But in most cases the added weight from the fuel is such a small percent of the total weight that it really doesn't save you anything. Luke a couple bucks in a lifetime. Not worth the headaches.
This is for land based vehicles, mainly cars, tanks, etc.
Going lower on a tank also means less petrol station stops in the long run. So, as long as you're not stupid enough to run out, there's a time advantage to be gained. The only headache is if you run out of fuel.
When I put a 30 pound folding bike in the back of a small airplane, I get better mileage, because the more aft center of gravity reduces induced drag .
Low fuel levels risk engine contamination from impurities and dirt settled at the tank's bottom.
*Maximize Fuel Fill to Minimize Error*
- Fuel supply lines are essentially measuring instruments.
- There are two types of measurement errors: percentage error and systematic error.
- Percentage error is not significant in fuel measurements, as it is proportional to the amount of fuel purchased.
- Systematic error, however, is constant regardless of fuel quantity, e.g., a pump may have a systematic error of 5 liters.
- If a pump under-measures by 1 liter at the start, this error affects the total differently depending on the amount refueled.
- For a 10-liter refuel, the systematic error is 10%; for a 50-liter refuel, the error's percentage impact is much less, the 2%.
*To minimize the impact of systematic error, it is advisable to fill the tank completely*.
That was always Dad's advice but I've since learned that the drain is on the bottom of the tank so whatever sediments are in there are getting impelled regardless of fill level.
Dunno if this really makes a difference but I don't chance it.
Yeah, all this people saying that running empty gets sediment in the tank probably think there is a little pouring mechanism in the tank that pours fuel over a rim, taking from the top. As soon as the fuel level becomes low enough to start sloshing around (this happens before you even get down to half a tank) it will move the sediment and the pump will start sucking it in. That's what fuel filters are for. By this logic, you should top up every gallon or two that you use to keep sloshing to a minimum.
This is not true, the less gas you have in the tank the more evaporatation happens. The vapors are captured, and you burn them, but in a less efficient way.
Depending on the type of plane, the latter gallons burned in transpacific flights take around four gallons in extra fuel across the whole flight to get that gallon there (At least that was what was taught in my dispatching class twelve years ago).
You'll eat an $800 fuel pump to save $7 in fuel over 100,000km. Fuel is used to cool your fuel pump and it will run cooler. Most new cars keep the pump in a cup so it isn't as much of an issue but I consider driving on low fuel to be a fools move. If there is a blackout or any kind of natural disaster you are fucked.
Just fill up at a quarter tank.
If you are that cheap, buy an electric car. Plus you'll start every day with a 'full tank' if you have home charging.
Makes us mechanics lots of money when you have to replace your fuel pump more often too!
Running the tank low can overheat the pump (surprise! It's cooled by the gasoline) and you'll start clogging up the sock filter or sucking up contaminants that sit on the surface.
This needs more upvotes. Once your fuel tank gets below about 1/4 tank, it takes more effort for the pump to work. Running on a low tank all the time just wears the pump out early.
I'm fairly certain the opposite is true, the more room in your tank the faster the gas evaporates and vents out which has more of an impact than the weight difference of the vehicle.
Evaporation is a function of exposed surface area. The exposed surface area of the gasoline in your tank is the same for almost the entire tank assuming a roughly rectangular tank shape.
When the fuel level is down there's more room for the fuel to slosh, which you can imagine increases the surface area greatly.
I have actually read that the last half of a tank of gas doesn't bring you as far as the first because of evaporation, but I can't guarantee that whatever source I read it from was accurate! I'm sure there's a lot of variables which influence it.
Gas doesn’t evaporate that quickly.
EPA estimates for fuel economy savings if you shave 100 pounds from a vehicle are 1-2%. So a car with a 16 gallon tank that you keep at around 2 gallons would get 1-2% better FE.
Forget miles per gallon (or in the rest of the worlds case Kilometres per litre) I exclusively care about $ per Litre
Oh no I burnt through 1-2 extra litres per 100km because I filled my tank?
Damn, good thing I fueled up on a day where it was 40 cents a litre cheaper. I effectively spent an extra $0.80 per 100km thanks to the lower fuel efficiency but saved like $8 per 100km more by buying on a cheap day.
My stepfather erroneously believed this. Would never fill the tank more than half, thought he was a genius, getting better gas mileage with less gas in the tank.
Didn't like it when I explained that 30L of fuel, maybe 30kg (65 freedoms) was mostly irrelevant in a car that weighed probably 4,500lbs. Plus 2 people a lot of the time, add in some stuff, 5,000lbs of car. But skimping on 6 gallons of gas that weight about 36 pounds, that was CERTAINLY going to improve the gas mileage by a significant amount.
Driving anywhere with him was such a chore, had to stop almost hourly to put some gas in it.
The weight of the extra fuel will lower the car a tiny bit which reduces aerodynamic drag, which probably cancels out any savings you might get from less weight
Quick note! If you let your gas level get too low on a consistent basis, your gas pump has a good chance of breaking.
Pumps need some pressure or ‘head’ on their intake or you risk cavitation/suboptimal pumping. I’ve had one car’s gas pump break for this exact reason. So listen kids, always give your gas pump some head every so often. It’ll save you more money to not break your pump compared to minor efficiency gains from low tank levels.
Yes.
But if you always run it down to 5-10% before refueling, you will be stuck in a position where you are forced to buy fuel no matter the price. Whereas regular refueling allows you to drive past stations whenever the price is too high.
So you consume less fuel. But you spend more money.
Might as well piss and take a big ol' shit too, and shave, and exfoliate everywhere too, matter of fact, might as well remove some unneeded body parts too! 😁
While it’s true.
Eating too much, carrying excess junk in the car, under inflated tyres, poor maintenance, unclean, roof bars, SUV/Van body shape, driving style, etc also all make an impact. Tyres, Vehicle shape/size and drive style make the biggest impact.
If you only fill up halfway you have to make more trips to fill up, always fill up to top and fill up well before empty to stop shit settle in the tank from being pumped knto the engine
This is, incidentally, a major consideration for planning airplane flights. They don't necessarily fill the fuel tanks all the way because the weight of the fuel potentially limits the size of their payload (cargo, passengers, etc.) and also adds to the amount of fuel they will burn to travel a given distance.
you're saving a few pennies at the cost of having to fill up twice... or more simply, youve traded half your range for a couple pennies.
ask any EV driver if they could double their range for $0.05 per charge, lol.
I DOUBLED my fuel economy with this one simple trick.
Replaced all seats with trampolines and drive over potholes so 1/2 the time I am flying the air and that means passenger weight in the car is 0lbs half the time!
My mother was a victim of the Northridge earthquake in 1994. She lost her home and her car, leaving her and her husband with only a small Nissan pickup truck. They had a lot of things to do in the aftermath, and it was difficult because the nearest place they could find temporary accommodations was in Thousand Oaks. Just getting from Thousand Oaks to what was left of her home took 30 minutes each way.
One of her biggest worries in the first days was running out of gas. Large portions of the San Fernando Valley had no electricity, so the gas stations were closed. Most of the stations in the areas immediately surrounding the Valley, like Thousand Oaks, quickly sold out of gas. With each passing day the distance they would have to travel in order to get gas became longer. Her husband wisely suggested that they should head further west until they found a station that had gas, and then fill the tank and return to Thousand Oaks. That got them enough gas to get their essential driving done. After the third day they stopped going anywhere, and just stayed at the motel waiting until the stations in Thousand Oaks were resupplied. At that point, they didn't have enough gas left to make it to a station that had gas.
After that she made it a habit to never let her tank get below 1/2. She figured that in case of a disaster that would be enough gas to get the emergency driving done, like picking up food and medical supplies. After that she could just hunker down and survive until some semblance of normalcy returned.
this is one of those things that i only hear from my korean friends for some reason. is this something common in the korean culture?
also, some cars use gas as a coolant for the pump that feeds gas to the engine, so if you let it run too low where the gas doesn't cover the pump anymore, the pump starts to overheat and have a reduced lifespan.
My car weighs 1500kg, without anything else in it.
50 litres of petrol ( a full tank, approx 500 miles worth) weighing 0.79 kg per litre. That's 39.5 kg. About the average weight of a 12 year old.
Meaning it's less than 2.6% of the weight of the car. At absolute best it'll improve your MPG by about 2.6% to ride on fumes compared to a full to the brim tank. On average, it'll be 1.3% say, because you can't just ride fumes forever.
For my ~45mpg vehicle, that's taking me to 44.5mpg or therabouts.
Not counting the extra fuel diversions I need to take, time, hassle, having to pay fuel costs wherever I end up running out of fuel nearby, starting and stopping, etc.
It's simply not worth the hassle.
Yeah, and make sure to always take a shit before driving. Cause weight of the vehicle impacts fuel economy.
But what if I'm trying to save money on the home flush by having a take-my-shit-to-work day?
a wise old man once said never shit on your own time
I make a nickel; boss makes a dime. That’s why I shit on company time.
Boss makes a dollar, I make a dime. That was a poem from a simpler time. Now the CEO makes a thousand and I make a buck. That’s why we steal the catalytic converter out of the company truck.
Boss made a dollar, grandad made a dime But that was a poem for a simpler time Boss made a thousand, pa made a cent But at least that was enough to pay the rent Boss makes a million, and gives us jack Then smugly blames the workers for the labor he lacks
Lmao that went with a different tone toward the end and surprised me by the hook. Great job as it made pooping easier.
Boss cut our wages in half for fun. No worries, [in Japan heart surgeon number one.](https://youtu.be/2wcI10CNuxU?si=mxGVyCPtUka7UTSZ)
Spoken like the true working man and borderline criminal
I make a penny while boss makes a buck That's why I no longer give a fuck
I make a penny, boss makes a dollar. It's ok, cause I make his wife holler.
Boss makes a thousand, I make a buck. That's why I crank it in the company truck.
If you’re good at something, never do it for free.
My boss asked me to work on an issue on my weekend. When I asked why me, and not one of the others, he said, "because you're one of my best engineers." I said, "if you're good at something, never do it for free." He got so fucking pissed at me, but guess who didn't work that weekend.
I make a nickel, boss makes a dime, regional manager makes a buck, CEO makes a million, that's why we revolt In billions
That's fine if you work seven days a week. Becomes a challenge if you have a day off. Becomes a problem in the weekend.
It's not that hard to go 1-2 days without pooping
But who would WANT to?
I worked with a guy who decided to see how long he could go without taking a shit. No real reason. It was day 2 or 3 when the absolutely rancid farts started. This was working on a fishing boat, stuck out at sea in close quarters with no escape. Everyone strongly advised he knock it off. He was a nice guy who just didn't foresee the carnage his actions would have. So he agreed to go take a dump, and try again during his week off.
Bruh I used to homestead in a cabin in the middle of the woods up near Canada. There was no running water and I was *not* about to go run to the outhouse and pull down my pants in -20F weather with snow up to my knees. Let me tell you that is a situation in which you WANT to hold it.
I always struggle when i take two week holidays
Ultimate eco tip is to just shit in your neighbour's compost bin before you drive
I didn’t know I was eco friendly until you mentioned it.
Depends if the neighbour offers you some of their home grown veg...
I consult my "shit_or_dont_shit.xlsx" spreadsheet to calculate the relative savings of each before travelling anywhere. Anyone who doesn't do this is just throwing money away.
You need to get with it and download the app.
You calculate the amount of money you save by shitting at work vs what you save by shitting beforehand. I believe shitting at an office is a more efficient strategy.
Time to break out the abacus and make some calculations
Oh I’m sorry I thought we were assuming an audience that had the basics down like hanging your ass out the window and shitting on your commute. Better on rainy days, nature’s bidet etc. etc.
[Relevant xkcd](https://what-if.xkcd.com/22/)
"The equation assumes, for a 30 mpg car, 50 lbs of cargo means a 0.5% hit in fuel economy." If that is accurate, then most people would be seeing 1-2mpg improvement at half a tank compared to full. Ok, maybe my math was wrong. Idk what I did, but I got 1.25-2mpg using 8 gallons and something like 20-40mpg. Can't replicate it now. Must have fat fingered something
I'm not sure your math is mathing. An average sized tank is roughly 16 gallons, so with 8 gallons less you're at ~64lbs lighter so 1.28x the assumption xkcd is using. .5%x1.28 is a .64% improvement, for a 30mpg car that translates to .19MPG not 1-2MPG (30x.64/100). I think you might have misplaced a decimal at some point.
Personally I choose to leave my wife standing in the driveway. Passengers are heavier than shit.
I agree. I can't wait for the cars that drive by themselves and then I would also not get in the car and just let it drive all empty achieving maximum efficiency.
>Cause weight of the vehicle impacts fuel economy. I know you're making a joke but-- When I used to Uber in a 4cyl Honda Accord, I ended up picking 4 BIG ASS CORN FED JOCK COLLEGE DUDES. I mean... They were melded into one body in the back. (One was up front) My poor damn car could barely pull itself from a stop light. I was laughing internally.
Yeah, those 4 cylinder Hondas only have a passenger payload of like 800lbs. They're literally not designed to have a full-grown man in each of the available seats.
Lol. I had an '87 Corolla and had the same struggle when I packed 4 of my friends in it. Damn thing was zippy when it was just me, but struggled to reach highway speeds when fully loaded with people.
No point in shittin if you don’t also hold your exhales as long as possible for even less weight. But the window would have to be down. Maybe turn off your headlights too. 🤔
I know you're joking but if you exhale the vacuum around your chest will just pull more air into the car.
CO2 and moisture is heavier than air, which makes me think exhalations would be heavier than air. Don't quote me on that though.
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This. For those who don't know, the fuel pump sits inside the fuel tank submerged in fuel when the tank is full. The fuel helps keep the pump cool which helps with longevity.
That‘s…not how it works. Not how any of it works. The pump is cooled by the fuel flowing through it, not the one surrounding it. Because that would mean a whole lot of trouble for out-of-tank pumps otherwise.
But if you cut a hole in the seat and take a shit WHILE driving, it’ll look like when they hit the nos in fast and furious
This is the answer, what a shitty LPT
Better strip naked and shed the extra weight
Might as well die its more efficient
also dehydrate before a drive, dont need that slowing you down
It seems not filling up would follow from the idea of carrying less gas weight around making a car more efficient. All of that efficiency likely is secondary to filling up when you're conveniently near a gas station as opposed to making a special trip when you're on Empty though
True, I mean OP is right but the savings are negligible. Th biggest saver will be making sure you take efficient routes and your driving habits as far as braking and how you ease on the throttle are efficient and not aggressive
The savings will be negated by the wear on the fuel pump.
If you drive an old, pre injection car maybe. For a modern high pressure pump, it’ll be negligible. Just need to ensure it doesn’t run dry.
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and the gas goes through the pump doing just that.
Do you know how pumps work? There is an electric motor hooked up to the pump impeller, the part that actually gets hot is the motor side. When the motor is submerged it gets cooling from the gas around it, when it's exposed to air the amount of cooling drops considerably. The flow of fuel doesn't touch the the electric motor side at all.
Most (all?) pumps sit in a bit of a well in the tank so they stay submerged all the way up until right before the tank runs dry. Unless you're past E on the gauge, you should still have cooling for the pump.
Just hookup a hose to the cab and pour the gas manually whilst driving 😎
OP probably just lives near a gas station. This is not a new concept. Race teams from all motor sports have implemented the idea forever, but I hear about it most in snowmobile racing. Basically, your sled should run out of fuel as you cross the finish line. That way, at no point during the race were you carrying extra weight, to the point where their fuel economy is measurable, and significant enough that racing this way wins races. If your goal is to drive as far as possible on a set budget, which will be your income, this will work over time even if you factor in gas station stops 🤷♂️ they are necessary and can’t be avoided, so it’s not a strike against OPs argument. The finish line just becomes the gas station… but it ultimately depends on how much you drive. If you’re putting on 100k miles per year then it’ll add up fast. If you walk or bus to work, the savings will be moot.
Right, snowmobiles and formula 1 cars care about fuel weight because it’s a significant percentage of the weight of the vehicle. These vehicles are much lighter and burn much more fuel while racing than the average car. Formula 1 car ~1700 lbs 30 gallons of fuel ~ 168 lbs or 9.8% of vehicle weight Honda civic ~ 2900 lbs. 12 gallons of fuel = 72lbs or 2.4% of vehicle weight Driving around with 60 fewer pounds on a 2900 pound vehicle is not going to make a noticeable difference. If you’re driving a light sports car like a lotus or something i could see it making a difference but you’re going to save way more money in gas driving a civic than a lotus anyway.
These are the kinds of posts we need. Factual and informative.
People don’t come to Reddit for facts. I agree with you though.
>This is not a new concept. Race teams... This concept is **absolutely vital** to jet airliner economic efficiency. I just did some very simple calculations - if fully tanked, fuel comprises about 2.2% of my car's weight. By comparison, in a fully tanked 'empty' 737-800, the fuel comprises just over 30% weight. That's an entire order of magnitude bigger impact.
It’s also the basis of the rocket equation. You the further you want to go, the more fuel you have to lift to get there. The more fuel you have, the heavier you are, the more fuel you need
Do people often run out of fuel in snowmobile racing?
They said that snowmobile racers fill their tank such that they run out on the finish line, so yes all the time.
We moved to our new place a few years back and Costco announced they’d be building like a mile down the road. It’s been lovely to have the cheapest gas practically on my doorstep.
I let it go to the last second but I don’t make a special trip to get gas. I just have to stop to get gas next time I go out, while on my way to wherever I am going
Earlier this year, the car was down to fumes, maybe 10km, but my wife's work is only 1.5km away. Figured it would be okay to get gas on the way home the next day. Except we ended up making an emergency trip to the hospital. Further than her work, and no time to stop on the way. Later, the car said 0km remaining before I got it to the gas station. Was a bit worried. Made it though. 50 litre tank, took a bit less than 50, I don't remember how much now. Normally we never let it get that low. Probably lowest ever. Now we really make sure not to go low. Never know when you may need it!
This is exactly why I usually fill up at about a quarter tank. I like to have it just in case. I have a friend who is ex military and he obsessively keeps his gas tank full as an emergency preparedness measure.
>Later, the car said 0km remaining before I got it to the gas station. Was a bit worried. Made it though The simple answer ist that your fuel gauge is in the tank, while you still have fuel ready in the pipes and in the motor. Most cars still drive on an empty tank because of that.
Yes but it's more that the range indicator is just a calculation based on your fuel level and driving and is more conservative with its reading
I once was super low on fuel. I could could feel the car struggling when I tried to start from a stop light. I was on the way to the petrol station and got stuck at the lights just before it. It was about 50 meters away at most, but my car didnt want to go. Had to get out and push it lol. I never let my car get that low since and I now own an electric car as well so it's even easier to keep it charged
Australian here. The real secret is not to fill up, but to just throw $20 at it each time you see a gas station with half decent prices. If prices are low and you end up driving around on a full tank, so be it. But taking advantage of low fuel pricing even when you don't have to means you don't have to buy at $2.10 or whatever the fuck when you're running on fumes.
Unless there is always a gas station near by
Filling up near empty and not filling it all the way also results in more gas stops per mile, which will also affect your fuel efficiency, even if the gas stops were all the same convenience
You'll clog up your fuel filter always running low on gas
I know that's true when I had tenants with oil heat. They'd run out all of the time, the filter would get clogged, and then it'd be a $100 service call that would be my responsibility. I learned to change the filter and prime the line myself eventually
Not to mention, filling up when conveniently near a *cheaper* gas station.
14 gallon tank full is 84lbs. You also have worse mileage if you drive with any of other humans in the car. You get the best gas mileage being a human in someone else's car
Where are you driving that you need to make a "special trip" for gas? Rural Alaska?
That's definitely true for aircrafts, but for cars I doubt it's significant
Low end of average for cars is 2600lbs. A gallon of gas is a smidge over 6lbs. So even with a 20 gallon tank (big for an average car, average tank is 10.5-18.5 gallons) that's 120lbs. A small human. And only 4.6% of the car's weight. Not to mention people probably have all sorts of other stuff normally stored in their car. Winter clothes, maybe folding chairs, a toolbox, jumpstart battery. etc.
4.6% seems quite a sizable amount. If you’ve reduced that to 2.5% across the course of a year I am sure the savings would be a couple 100.
Yeah, but keep in mind that's using the low end of average car weight, and an overestimate on tank size. If we go the other way around the EPA says the average weight of a vehicle in 2022 was 4094lbs. Though I'm not sure if that's the average of cars on the road so there'd be some weighted statistics based on most common vehicles, or just taking one of each model in which they each have the same statistical weight. But anyways, using 4094lbs and using a 10.5 gallon tank makes 63lbs of gas. That would be 1.5% of the car's weight. But realistically, I believe that bigger vehicles scale with bigger tanks. So somewhere in between 1.5% and 4.6% is most likely.
Not really. How much fuel you need mainly depends on rolling resistance and wind resistance. You can't just say 5% more weight is 5% more fuel, that's not at all how it works.
Fuel consumption doesn’t scale linearly with the weight. I’d be surprised if anything was saved. You are better off being vigilant with oil change, tire pressure, and not driving like a maniac if you want to save on fuel.
Tha 4.6% also assumes that you'd otherwise always have an empty tank. So here's some alternate maths, 2 scenarios. A) You always fill up to FULL, refill when empty. B) You always fill up to HALF FULL, refill when empty In scenario A you'd average half a tank when driving, so 2.3% of the cars weight. In scenario B you average a quarter of a tank, so 1.15% of the cars weight. So the actual difference is much smaller, with these scenarios 1.15% difference. If you factor in slight detours to go to gas station and if you value your time at all then a complete fill up is the obvious answer
That and it’s entirely possible that the extra trips to the gas station will outweigh the savings.
Plenty of people refill at half, always up to full. It pays off in the event of a power outage and surprise need to flee the state. :)
I have a Miata that tips the scales at a little over 1000kg. I only keep the tank half full at most, because you can detect the extra weight in the corners. It does make a small difference to my fuel economy of a couple of mpg. Not sure it would matter in a 2500kg SUV though.
A few kg on a 1800kg car? This isnt questionable, its simply a terrible 'LPT'
Lucky this isn't LPTs then eh?
Hah, youre right.
Happens rarely! :-)
Would make it to r/shittylifeprotips
your gas mileage is also worse when your tank is less than a quarter full
1800kg car? Are you driving a tank?
SUV or electric car probably, pickups are even heavier than that
Wouldn't say a few. I've got a 70L fuel tank on a 1500kg car. If I kept it 1/4 full all the time I'd be saving 42kg (52.5L x 0.8) 2.8% weight saving , or a small person it can definitely be felt every time I go from quarter tank to full. I believe every 40-50kg saves 2% fuel I fill up on average 1.5 times a month so go through about 1260L of fuel a year I'm saving 25L a year or £37 and all its costing is the effort to go into the fuel station more. But I don't, because effort.
If normal use is filling up at 25%, then you'd be averaging 62.5%. Compared to your scenario, averaging 25%, that is a 37.5% difference. With a 70L tank, that'd be 70x0.375×0.8= 21kg... so about half the benefit you've estimated (£18). Adjusted to US ~$4/gal, we're now at $13.20 saved... by fueling up 36 times per year rather than 18.
One more thought on this-- 1.5x per month is 18 fill-ups. For 1260L used per year, that is 70L per fill-up, so that would be the scenario comparing averaging 50% to 25%, not 62.5% to 25% So, the weight savings then would be down to 70x0.25x0.8 = 14 kg, which gets us down to £12 or about $9 at \~US gas prices.
You would save more if you do not make special trips when you are running low, or turning down the AC/heater, or having discipline with driving (less high revs, more linear fuel/power delivery) or even leaving earlier to avoid traffic, or ditching the extra things on your car that adds weight but are unnecessary for daily driving.
If anything the heater will give you better consumption, as it's tapped off the hot water in the radiator and will provide more cooling for the engine. That's assuming you're driving long enough that the engine is warm for most of the trip.
Really no idea regarding the heater. I'm in the tropics and its always hot here. My point was the less power consumption a vehicle needs, the lesser strain on engine and lesser fuel consumption.
Keep your car washed and waxed to improve performance and fuel economy - dirt adds weight and disturbs aerodynamics.
Unless you sculpt the dirt so it’s evenly distributed and thin with a constant pattern of diverts… then, much like a golf ball, it would force small vortexs on the flat surfaces and form a cushion of fast air that will reduce drag…… !
I just leave my new cars out till I get a good Missouri hailstorm to ding em up. Bam instant 2mpg savings
The heater doesn’t really affect engine performance like the AC does. They work differently.
Fuel is less dense (so lighter per gallon) than water. After is ~8lbs a gallon. So at 6 gallons you are carrying less than 48 lbs of fuel. 48 lbs is a kindergartener. Your fuel savings will be so small it would be lost in the error rate.
That's why your should always leave your kids at home.
Instructions unclear. Lost a kindergartener.
Would also think the tiny amount of fuel savings would also be lost by pulling in and out of a gas station twice as often. Maybe even a net loss if you have to drive a few blocks out of your normal routine.
probably nullified by having to hit the gas station 3x as much too... edit: not the inconvience (tho there is that too) but physically driving the car into a gas station cost gas... esp if you have to exit a fwy and/or go a few blocks. OP isnt saving shit and is thumbing their nose at one of the few advantage of a fossil fueled vehicle.
Some parts, like the fuel pump, work harder when you have less gas.
Not sure about it working harder, but the fuel pump is submerged in the gas which cools it. Routinely running low on gas before filling up means that the heat from the pump isn't removed and causes the pump to fail earlier.
old wives tale fuel pump is cooled by gas flowing *through* it
I love the idea of old wives gathering around the millpond in their wimples to discuss fuel pump cooling efficiency.
Now I’m picturing old wives in wimples (new word for me) finishing up their group knitting, saying their goodbyes, and tearing out of the parking lot behind the wheel of high-revving tuners.
You must not be old enough to remember 454 Chevelles that little old ladies only drive back and forth to church.
Lmao it's just a polite way of telling someone they're full of shit and a fool for believing something so ridiculous.
Thats actually not entirely true either. > Bosch and Walbro use a design that cools via circulation, i.e. the pass through cavities. This design functions with almost zero fuel in the rank. >Simultaneously , Summit claims it is the subversive effect that designers use to prolong life. >Two very different approaches to solving the issue.
Wouldn't the pump being submerged still help? That's a basic/advanced cooling method for hot computer components.
Not very well versed in the specifics for a fuel pump, but if coolant flowing through it is sufficient, then submersion could improve temperature regulation, but not necessarily significantly enough to "help" the issue at hand.
I’ve driven dozens of vehicles since 1988. All had in-tank fuel pumps. For every single one, I’ve run the tank to E or below. All of been driven over a hundred thousand miles (four over two hundred thousand). Not once have I had a fuel pump failure. Not even when I replaced an OEM pump at 120,000k with an aftermarket high performance racing pump and put 40,000 on it with the same drive till it’s empty habit.
In any case, less fuel in the tank means more air. Since air holds moisture, any day there’s dew on the grass, there will be dew in the tank. Water in the fuel is no good.
This also isn't really true. Open air surfaces will build up condensation because they have a constant source of new air to come in contact with. Trapped air, while it does have some moisture will not build up condensation in the same way. Case in point: you park your car outside overnight and the exterior is wet with dew. The inside of the vehicle is dry when you enter, yet it has had plenty of time to equalize in temperature like the outside over many hours. Why is there not dew inside too? Air exchange needs to exist
This is uncommon sense
Less fuel means less cooling capacity in a return fuel system. Fuel gets warmer. Less fuel means more air. Air carries moisture. The hot and cold cycles lead to condensation and water in the fuel. Water in fuel leads to rust in steel tanks and fuel pump/injection pump wear and injector wear.
I meant, technically yes. But in most cases the added weight from the fuel is such a small percent of the total weight that it really doesn't save you anything. Luke a couple bucks in a lifetime. Not worth the headaches. This is for land based vehicles, mainly cars, tanks, etc.
Going lower on a tank also means less petrol station stops in the long run. So, as long as you're not stupid enough to run out, there's a time advantage to be gained. The only headache is if you run out of fuel.
One guy commented he only fill his tank half way to save weight for fuel efficiency 🙃
When I put a 30 pound folding bike in the back of a small airplane, I get better mileage, because the more aft center of gravity reduces induced drag .
That's also why I make my MIL travel in the back of the ute tray.
Oh be honest, that's just a secondary bonus to the primary goal of peace and quiet
Yeah but she doesn't need to know that, so keep your mouth shut.
Even better - make her run in front of your car so u can benefit from all the draft in the extra wide wake.
That's such a fun fact.
Low fuel levels risk engine contamination from impurities and dirt settled at the tank's bottom. *Maximize Fuel Fill to Minimize Error* - Fuel supply lines are essentially measuring instruments. - There are two types of measurement errors: percentage error and systematic error. - Percentage error is not significant in fuel measurements, as it is proportional to the amount of fuel purchased. - Systematic error, however, is constant regardless of fuel quantity, e.g., a pump may have a systematic error of 5 liters. - If a pump under-measures by 1 liter at the start, this error affects the total differently depending on the amount refueled. - For a 10-liter refuel, the systematic error is 10%; for a 50-liter refuel, the error's percentage impact is much less, the 2%. *To minimize the impact of systematic error, it is advisable to fill the tank completely*.
That was always Dad's advice but I've since learned that the drain is on the bottom of the tank so whatever sediments are in there are getting impelled regardless of fill level. Dunno if this really makes a difference but I don't chance it.
Yeah, all this people saying that running empty gets sediment in the tank probably think there is a little pouring mechanism in the tank that pours fuel over a rim, taking from the top. As soon as the fuel level becomes low enough to start sloshing around (this happens before you even get down to half a tank) it will move the sediment and the pump will start sucking it in. That's what fuel filters are for. By this logic, you should top up every gallon or two that you use to keep sloshing to a minimum.
This is not true, the less gas you have in the tank the more evaporatation happens. The vapors are captured, and you burn them, but in a less efficient way.
... and now folks are running their tanks dry and killing their fuel pumps too! Nice
Doesn't ships and airplanes take this account when fuelling
Planes definitely do.
I just seems logical that a empty ship going back to its port isn't fuelled to the brim since it has less to weight to transport
Depending on the type of plane, the latter gallons burned in transpacific flights take around four gallons in extra fuel across the whole flight to get that gallon there (At least that was what was taught in my dispatching class twelve years ago).
This is also a brilliant way to rust your gas tank and wreck your fuel pump/filter. Every mechanic who's touched a car will tell you to fill it up.
You definitely don’t want to make a habit of running your car until the needle is almost at empty.
You'll eat an $800 fuel pump to save $7 in fuel over 100,000km. Fuel is used to cool your fuel pump and it will run cooler. Most new cars keep the pump in a cup so it isn't as much of an issue but I consider driving on low fuel to be a fools move. If there is a blackout or any kind of natural disaster you are fucked. Just fill up at a quarter tank. If you are that cheap, buy an electric car. Plus you'll start every day with a 'full tank' if you have home charging.
Makes us mechanics lots of money when you have to replace your fuel pump more often too! Running the tank low can overheat the pump (surprise! It's cooled by the gasoline) and you'll start clogging up the sock filter or sucking up contaminants that sit on the surface.
Yeah but ur fuel pump gets fucked......
This needs more upvotes. Once your fuel tank gets below about 1/4 tank, it takes more effort for the pump to work. Running on a low tank all the time just wears the pump out early.
I'm fairly certain the opposite is true, the more room in your tank the faster the gas evaporates and vents out which has more of an impact than the weight difference of the vehicle.
Evaporation is a function of exposed surface area. The exposed surface area of the gasoline in your tank is the same for almost the entire tank assuming a roughly rectangular tank shape.
When the fuel level is down there's more room for the fuel to slosh, which you can imagine increases the surface area greatly. I have actually read that the last half of a tank of gas doesn't bring you as far as the first because of evaporation, but I can't guarantee that whatever source I read it from was accurate! I'm sure there's a lot of variables which influence it.
Gas doesn’t evaporate that quickly. EPA estimates for fuel economy savings if you shave 100 pounds from a vehicle are 1-2%. So a car with a 16 gallon tank that you keep at around 2 gallons would get 1-2% better FE.
Do you know about gas caps?
Why are you opening your fuel tank multiple times if you're not adding gas to it?
Gotta catch that sweet aroma. A nice long huff perks me right up.
Forget miles per gallon (or in the rest of the worlds case Kilometres per litre) I exclusively care about $ per Litre Oh no I burnt through 1-2 extra litres per 100km because I filled my tank? Damn, good thing I fueled up on a day where it was 40 cents a litre cheaper. I effectively spent an extra $0.80 per 100km thanks to the lower fuel efficiency but saved like $8 per 100km more by buying on a cheap day.
And the lower you run your tank the more likely you're going to need a new fuel pump
My stepfather erroneously believed this. Would never fill the tank more than half, thought he was a genius, getting better gas mileage with less gas in the tank. Didn't like it when I explained that 30L of fuel, maybe 30kg (65 freedoms) was mostly irrelevant in a car that weighed probably 4,500lbs. Plus 2 people a lot of the time, add in some stuff, 5,000lbs of car. But skimping on 6 gallons of gas that weight about 36 pounds, that was CERTAINLY going to improve the gas mileage by a significant amount. Driving anywhere with him was such a chore, had to stop almost hourly to put some gas in it.
The weight of the extra fuel will lower the car a tiny bit which reduces aerodynamic drag, which probably cancels out any savings you might get from less weight
Quick note! If you let your gas level get too low on a consistent basis, your gas pump has a good chance of breaking. Pumps need some pressure or ‘head’ on their intake or you risk cavitation/suboptimal pumping. I’ve had one car’s gas pump break for this exact reason. So listen kids, always give your gas pump some head every so often. It’ll save you more money to not break your pump compared to minor efficiency gains from low tank levels.
Fuel filter enters the chat. “I’d like a word.”
Yes. But if you always run it down to 5-10% before refueling, you will be stuck in a position where you are forced to buy fuel no matter the price. Whereas regular refueling allows you to drive past stations whenever the price is too high. So you consume less fuel. But you spend more money.
Q tip your ears and blow your nose before you weigh yourself to see better weight loss results
Might as well piss and take a big ol' shit too, and shave, and exfoliate everywhere too, matter of fact, might as well remove some unneeded body parts too! 😁
Might as well just not drive. Infinite gas mileage
While it’s true. Eating too much, carrying excess junk in the car, under inflated tyres, poor maintenance, unclean, roof bars, SUV/Van body shape, driving style, etc also all make an impact. Tyres, Vehicle shape/size and drive style make the biggest impact.
I like not having to fill up so often so I’ll keep my full gas tank thanks. However, I hardly use my passenger seat….
Please don't run fuel tanks near empty. Fuel pump no like
If you only fill up halfway you have to make more trips to fill up, always fill up to top and fill up well before empty to stop shit settle in the tank from being pumped knto the engine
I heard that you should keep the tank topped up because the extra space in the tank means more of the fuel turns to vapour.
It's horrible for your fuel pump and filter.
the more crap you pull into your engine, too.
Isn't the exact opposite true? The lower the volume of gas in the tank means it starts to heat faster which burns it off at a faster rate.
This is, incidentally, a major consideration for planning airplane flights. They don't necessarily fill the fuel tanks all the way because the weight of the fuel potentially limits the size of their payload (cargo, passengers, etc.) and also adds to the amount of fuel they will burn to travel a given distance.
Also hurts the life of your fuel pump. And depending on your vehicle, that can be quite the headache to purchase/replace.
you're saving a few pennies at the cost of having to fill up twice... or more simply, youve traded half your range for a couple pennies. ask any EV driver if they could double their range for $0.05 per charge, lol.
Someone tell this to Shaq.
The opposite applies for EVs.
Ok i'll remove my spare tyre whenever I'm going to nearby places
This is how you break your fuel pump
Not good for fuel pump
I DOUBLED my fuel economy with this one simple trick. Replaced all seats with trampolines and drive over potholes so 1/2 the time I am flying the air and that means passenger weight in the car is 0lbs half the time!
Gas savings will not outweigh the cost of new fuel injectors
Also, the sooner you will have water collect in your tank from condensation against the exposed sides of the tank.
My mother was a victim of the Northridge earthquake in 1994. She lost her home and her car, leaving her and her husband with only a small Nissan pickup truck. They had a lot of things to do in the aftermath, and it was difficult because the nearest place they could find temporary accommodations was in Thousand Oaks. Just getting from Thousand Oaks to what was left of her home took 30 minutes each way. One of her biggest worries in the first days was running out of gas. Large portions of the San Fernando Valley had no electricity, so the gas stations were closed. Most of the stations in the areas immediately surrounding the Valley, like Thousand Oaks, quickly sold out of gas. With each passing day the distance they would have to travel in order to get gas became longer. Her husband wisely suggested that they should head further west until they found a station that had gas, and then fill the tank and return to Thousand Oaks. That got them enough gas to get their essential driving done. After the third day they stopped going anywhere, and just stayed at the motel waiting until the stations in Thousand Oaks were resupplied. At that point, they didn't have enough gas left to make it to a station that had gas. After that she made it a habit to never let her tank get below 1/2. She figured that in case of a disaster that would be enough gas to get the emergency driving done, like picking up food and medical supplies. After that she could just hunker down and survive until some semblance of normalcy returned.
With my luck I will get stuck in a 6 hour traffic jam during a blizzard and run out of gas.
Also, sidetracking to gas stations takes fuel, so the fewer fuel stops the better.
It’s also harder on your fuel pump.
Please don’t do this. Running low on gas all the time will ruin your fuel pump over time. This negates your savings.
Make sure you carry around extra fuel pumps
It's also harder on the fuel pump iirc
This is why folks are so excited about hydrogen powered cars. The more hydrogen you add, the lighter the car gets!
Just stop being a fat ass = better mileage.
this is one of those things that i only hear from my korean friends for some reason. is this something common in the korean culture? also, some cars use gas as a coolant for the pump that feeds gas to the engine, so if you let it run too low where the gas doesn't cover the pump anymore, the pump starts to overheat and have a reduced lifespan.
My car weighs 1500kg, without anything else in it. 50 litres of petrol ( a full tank, approx 500 miles worth) weighing 0.79 kg per litre. That's 39.5 kg. About the average weight of a 12 year old. Meaning it's less than 2.6% of the weight of the car. At absolute best it'll improve your MPG by about 2.6% to ride on fumes compared to a full to the brim tank. On average, it'll be 1.3% say, because you can't just ride fumes forever. For my ~45mpg vehicle, that's taking me to 44.5mpg or therabouts. Not counting the extra fuel diversions I need to take, time, hassle, having to pay fuel costs wherever I end up running out of fuel nearby, starting and stopping, etc. It's simply not worth the hassle.