Definitely fake. Gordon didn't even drive it for the stunts:
"CONCORD, N.C. - Pepsi has unveiled the video it shot at Troutman Motors and Philip Morris here in Concord in February.
The video, which is promoting Pepsi Max, features NASCAR racer Jeff Gordon in disguise taking a test drive of a new Camaro.
Gordon takes the salesman for a wild ride through the Troutman Motors lot, into Philip Morris, including racing along the top of a loading dock.
Racer Brad Noffsinger, who works with the Richard Petty Driving Experience, did the stunt work for the production.
The video was produced by Gifted You, a division of Will Ferrell’s Funny or Die company. About 75 people were employed during the shooting of the video."