laff if ya want, I drive an 04 impala. Its mostly for commuting, so I wont go crazy on it, but I just cant leave a vehicle stock. K n N air filter, Platinum +4 plugs, good wires is all Ive done so far, but theres more on the way( ignition, exhaust...etc). 3.4 l, and I'm getting 34- 36 mpg, very good for a bigger car, I think so anyway. Oh yeah, castrol syntec 5w30 as well.