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Originally Posted by Raddman
One thing that I have found out is that you can top off your Corolla almost up to a gallon more, I was able to pump/squeeze almost 14 gallons in one time that I was almost empty so if you don't do that everytime it will throw your gas mileage figures off  ...Radd Guy...
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Actually it is accurate no matter how much your tank can hold. You just have to use the same method to fill it every time. I stop pumping as soon as the pump shuts off to avoid putting gas in the filler tube.
So I fill up and write down the mileage.
When the car gets low again, I fill up again and write down how much gas I put in and the mileage. By dividing the mileage by the gallons I put in, I can get my mpg.
Any slight variance in how much gas you can fit in doesn't affect the figures much when you consider how many times you fill up, it averages out.