um...not to sound like a smart-@$$, but I'm sure there's a reason they tell you to use Premium fuel ONLY. You just spent how much on your GXP?...i would say protect your investment and take care of the car the way they tell you to, warranty will not cover whatever messes up from running the wrong octane fuel through a high performance V8. That is driver error, not manufacturer defect. Im not trying to sound rude and you have every right to take care of your car however YOU choose to do so, just my suggestion. then again, im not sure what repurcussions may arise as a result of running regular through an engine tuned for Premium fuel, maybe nothing. OR it could all be a conspiracy between the dealerships and gas companies, haha, i wouldnt be surprised...Originally Posted by GXPimpin
