Quote:
Originally Posted by Endlessnoob
the 10.89 is not the number showed on the computer, it is mileage last tank / gas filled this time. the computer showed 15 mpg, but i never reset it since I bought the car. I just reset the MPG this time after I filled the tank, and now it shows 13.8 MPG / 14 MPH
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You might be dealing with inconsistencies in gas pumps being able to fill up your tank which is going to skew your calculations. If you didn't truly top it off the previous fill-up but did this time then you will end up with a lower than normal calculated mpg. Use the same pump at the same time of day for your next fill-up and see what it comes out to.