Originally Posted by SAMzG35

dont matter what you do, the MPG would still suck on a G considering its a 3.5l V6. I used to get way better mileage in my 4.6l V8

Originally Posted by Hydroshock

Have you actually calculated your miles based on your total miles and how many gallons you're putting in? Everyone is suggesting things to help improve mileage that usually have a marginal effect. Poor maintenance shouldn't cut your mileage nearly in half without at least a check engine light. You would be pouring tons of smoke or driving like you're on a track constantly. Even when I drove my car hard I got 15mpg city with my overall avg at 18.4mpg.

There is an issue with some cars where the tank actually doesn't fill all the way. Mine occasionally will only fill half the tank and the pump refuses to pump any more as well as the light coming on when there is still 5-6 gal left in the tank, but it hasn't been a terrible hassle as it comes and goes. I don't know how relevant that info is if you have calculated your mpg. Sites like gasbuddy.com have a fuel logbook to track over time.