7:22.4
This was done with Corvette racing driver Jan Magnussen at the helm.
http://motorgears.blogspot.com/2008/...hevrolets.html
http://www.fastestlaps.com/index.php...=49076d6f883e4
Note that there isn't really any proof of the lap yet and it doesn't have the usual GM level of documentation. This is either fake or GM just doesn't have the story ready for release yet. Time will tell . . .