only getting 15 mpg, is that average for anyone else? on 1998 Pontiac Grand Prix GTP

what can i do to help get this higher

Asked by for the 1998 Pontiac Grand Prix GTP
depends on driving conditions and your kind of driving
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2 more answers
It also depends on the maintenance you have had performed. Fuel filter, tune up, air filter, oxygen sensor, oil change on a regular basis, what type of driving do you do, how hard do you accelerate, etc.
Mine gets 17 mpg driving around town and that is ave. But if your driving on the freeway then it's very bad. Check your fuel lines under the hood to make sure that they are not leaking on top of the supercharger at the connection to the fuel rail. I had this problem.