when people work out their mpg, you cant say that you get 100 miles from a tenner, there is no way that you will get an accurate measure of what the mpg is.
If you want to really work out the mpg you need to fill the tank, zero the trip mileage, run it to empty fill it up again and work out how many gallons that you have put in, then you will get your exact mpg.
Sensai, im with winpro, there is no way that your combo is doing 60mpg, i would be willing to put money on it, but then i could be wrong, but why dont you fill the tank right up and work it out and let us know the actual mpg.
Sensai, how many miles do you get from a tankful?