Do cars run better on fuller tanks of gas?

Question

I've been broke lately and only putting in 5 dollars worth of gas at a time, which only lasts me about two days. However, last week I put in $15, and my tank seems to be lasting longer (as in, I'm not using gas at the same rate). My car, which is a 2005 Corolla, seems to run better with more gas. Is there any scientific basis for this?

Answer 1

I think the gas last longer if it's full

Answer 2

well u wont get better fuel econamy but it could help a lil if your tank was dry/out of gas and u only put $5 in gas then the pump in the tank might be sucking in more air than gas and with more gas in the tank the car wont be pulling more air and it will there for seem to run better because it doesn't need the car to hit a bump or rock back and forth inorder to get gas

Answer 3

Nope, fuel efficiency is not effected by the amount of gas in your tank at all. Its all in the perception you feel when you have to fill up $5 3 times versus $15 one time.

$5 in gas is not very much gas these days

Answer 4

If your engine is constantly sucking the sediment that builds up at the bottom of your tank when it only has $5 worth in there that could have an impact. But, $15 worth of gas is heavier, so it should diminish your mileage. In either case, the difference shouldn't be measurable except with highly sensitive scientific instruments.

You're imagining it. :)

Answer 5

First of all the only accurate way to figure fuel mileage is to carefully fill your tank up at a station and noting the pump and position your car is sitting. Note the car odometer

Run your tank till the red warning light comes on and return to the same station in the same position. Fill the tank up and figure your mileage.

Gas gages are as accurate as wind blowing clouds. General and inacurate.

Answer 6

More gas = more weight = lower gas mileage.
Thats why airplanes carry the minimum amount of fuel that
they can get away with.

Answer 7

just a coincidence.