My GXP gets pretty decent gas mileage.
Burning oil is so hit and miss.
My buddy's 2011 silverado burns zero oil and its over 25K miles, then theres this other person we know and his truck burns 1 quart per 3k miles. Which by GM standards is 100% normal. So I wouldnt be turned away by the minor fact that it may burn 1ish quarts per 3,000 miles, figure its only 3-5 bucks worth of oil that you are using for that given time.
when a gen five screams, its just super,
Pontiac Grand Prix GTP Dyno, Gen V Supercharged - YouTube
don't know whos car that is, but bolt on a cone filter and your pretty much there.
(in Edmonton winter I get about mabey 15.5mpgs of pure city. in summer about 18)
in the 5.3?
My 4x4 hemi gets that mpg...for a dd, I gotta have one vehicle that's half decent