Love this car. Was looking for a toy and almost went with a Vette, but have always loved sleepers (cars that 'surprise' without looking like they should). So much fun and the expressions are priceless, although not usually around to see them unless I catch a light further up the road. My overpowering thought when I leave someone in the dust is 'google it. G8GXP'. Sooo much fun, yet very drivable and comfortable on the road. Best MPH on a trip is just under 25, but like others have said, 'who cares'. BTW, I have the 6 speed manual. The drop down wouldn't let me choose.
My GXP is a garage queen. 3000 miles after 15 months. BUT it has been slightly modified. Kooks headers, Vararram cold intake, cat delete, SLP supercharger, engine tune and trans tune. It is simply the greatest sleeper ever. A 4 door sedan that can blow just about anything off the road! If you like 500 HP at the rear wheels, this is the way to go. Keep in mind Fly wheel HP doesn't tell the whole story! All these inflated HP numbers are at the Fly Wheel. They made me rate fuel economy. WHO CARES? At this performance level and low miles driven, it does not matter.
Bought a used 09 GXP for 32.7k with 5600 miles. Hot White with black & red leather. 6 speed manual. Added Corsa exhaust already and sounds great, much deeper and burbly. Love the car! Really fun to drive, and you never see one and I live in Houston. Have had zero issues so far. Car feels solid & unlike some I really like the stereo. It's not as clear as some, but the windows down I can be driving 60 and still hear very clear. No one has messed with me yet. I have people all the time ask me about the car and what it is. They can't believe the engine specs. You pop the hood and tell them the battery is in the trunk and they laugh. At my age 42, wife asked if I was having a mid-life.
Fast, comfortable and smooth ride on poor roads. Very quite cabin. Responsive steering. Good brake performance. Very supportive seats. Distinctive styling. Solid clutch and transmission. Good consistent power. Nice exhaust note. Head turner (thats a Pontiac?).