Alright, so as you guys know, I have a 2003 Mustang GT Convertible Centennial Edition. I drove it up from Florida and it got pretty decent MPG on the highway, about 22 on cruise control the whole way. But in the city and some highway I'm getting pretty bad gas milage, about 8-10MPG, so far I got about 60 miles on a quarter tank ( I filled up the the very neck! ) I was driving conservatively to see how much it would get, the car now has 40K miles. I don't know basically anything about this car since the owner wasn't there when I bought it and couldn't ask any questions ( I bought it from his mother who did the deal) All I know is he probably took it to this shop that they said they get all their cars done at, ( not a great shop fyi.) and he did oil changes with what seemed to me pennzoil. Again, he had the stock g-force tires on it, stock brakes, and everything else stock, (the brake fluid is greenish color, I thought it would be better since the car has low miles). On another note the car has a problem with power, ( I don't get a great throttle response even when I slam the gas. ) it makes a weird sound like somethings shaking, and it has troubles starting sometimes even after driving 15 minutes, parking, and coming out 2 minutes later.
So that seems to be all the problems I've been having with it, I know I wrote a lot but I'm trying to give you guys all the information I got, let me know if you need to know something I left out. Thanks so far! Great forum and help from everyone!