Not sure about the G6, but the one in my Focus has 55,000 miles and has been "cleaned and reacharged" twice and still works like a champ. I never really notice that much in MPG, maybe 1 or 2 highway like Fusion stated, but I think I noticed an improvement on off-the-line accel and pickup. Even if it doesn't do any of the above, like Hambone says, it'll be the last air filter you'll ever buy for that car.