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Oh by the way, I think it's pretty common sense not to go off the onboard computer either. The ONLY way to check and know gas mileage is to simply fill up and do the mileage divided by gallons method.
All else is irrelevant and pure speculation on the computers part.
Note I have seen some of these on board computers be within .5 mpg of accuracy to what you really got, but on the next tank I've seen it be 1.5 mpg off too.
They are based on the mileage you've driven and purely estimating how much gas is left in the tank based on the sensor in the tank.
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