I don't think he is. They were talking about him on Track Side last night and kept refering to him as Mike's cousin "twice removed". The commercials are great, but I'm pretty certain he;s just an actor.
OK - since I got a thumbs down for telling the truth, I sought out the real answer. I finally found an article on MSNBC.com about Geico and their commercials. This next paragraph came from it:
*** Flop or not, Geico's admen are already preparing for a post-caveman era. As the fourth largest car-insurance company in the nation, its share of the market is only 6.3 percent (industry leader State Farm is at 17.7 percent). The next shtik features a preteen boy named Lauren Wallace, who yearns to make it as a NASCAR driver. The fictional "third cousin, once removed" of real NASCAR driver Mike Wallace, who races Geico's sponsored car, he careens through the grocery store with a shopping cart. It's cute, kind of. But coming on the heels of a terminally hip Neanderthal, pretty much anything is going to seem like a letdown. *****
--- see - FICTIONAL.
I still can't find out the actors name though, dang it.