K
kissyloves8
...what could be wrong? is there something i can do to improve the mileage?
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I have a 2008 pontiac grand prix; i am only getting 21 mpg and that's highway;...
T
The Eagle Keeper
The other dudes are right + is there any excess weight your lugging around in the trunk. Every 100 lbs can take away a 1/2 mpg. Also, are you going the posted speed limit? Most cars are geared to get their best mpg's while going 60 mph. Any faster than that & the engine has to really push against wind resistance. The Gran Prix is a fairly aerodynamic car, but it's a heavy one.
H
Howlin_Mad
You can try a higher octane fuel or a different brand of gas. I have notice I get poor gas mileage with Arco Gas vs. Chevron/Shell/76. Also when was the oil changed last and are the tires properly inflated for you vehicle? The inside of the driver's side door there is a sticker that would tell you the proper psi for you tires if you have stock tires.