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I love my G8, its a blast to drive and I still get compliments on a 4 year old car. I have a Rotofab intake, Solo catback, Kooks mids, and a custom tune. These mods alone did more than wake the car up, they gave it a good kick in the rear. I currently get 15+ mpg city driving and that's with a very heavy right foot and AFM turned off. I don't do a lot of highway driving so can't help you with the mpg's there. The only other mod I have planned in the near future is an LS9 cam swap along with all the necessary parts to fully eliminate the DOD lifters.
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