Most of the basic mantience is good. I don't do bad now averaging 22-23 sometimes more with mainly highway driving. I just think it can do better. I saw an ad on here for a $69 grand prix chip that will increase hp by 60 and 6-7 mpg.....I wonder if that works or how complex it is to install? A few mpg here and a few there gets to 30 or at least thats my goal. What do you get on yours?