I currently own a 2002 Pontiac Grand Prix GT 2dr 3.8L with 241,000 miles on it & for some reason it's going thru fuel a lot.
I was at 1/4 tank on Monday morning & put in $6 which didn't move the needle a bit.
Tuesday morning I put in $21 in which only gave me 1/4 tank more than previous after driving 270 miles during the week to & from work to home & no extra driving I'm back to 1/4 of tank.
If I can find out why it's doing this will determine whether or not I will keep this car to 300,000 miles that was the goal.
if you realize how far you went and what motor you have.... you are getting more then 16mpg and that's city miles that your talking about. for a v6 that is pretty dang good. my 02 grand prix has the 3.1 and I drive like I stole it and I get nearly 280 miles on every full tank which is nearly 16.3mpg. if I take it easy and go long distance taking the freeway, I get nearly 400 miles per full tank. my car has about 224000miles on it and it purrs like a kitten. it is a great family car. gm's 3.1, 3.4, & 3.8 have simple problems such as the head and intake gaskets have an issue of lasting more then 80000-120000miles and need replaced with a new and upgraded gasket, which I have already done my self to my own car and it still runs great like it just rolled off the assembly line