What is the gas mileage on a 2002 pontiac bonivile?
Edmunds says 17 MPG city 27MPG highway 21MPG combined. Your car has an 18 gallon tank and gets an estmated 306 miles city and 486 miles highway. http://www.edmunds.com/pontiac/bonneville/2002/features-specs.html?style=19050
It sounds like your gauge problem could just be a bad fuse.
usually 19 around town and 23-22 mpg with mixed highway / city driving.
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