i have on 06 gt and i bought it will 43000 miles and it has 83000 now and i havent ran into any problems yet. youll love the car once you get in it and hear that supercharger whine. on the gas mileage i usually get about 385 to a tank and my mom has a N/A grand rix and she gets 400 to a tank so its not that big of a difference. did you kelly blue book the car and see what the private party value is on it? check that first before just going and buying it