SPEED DEMON: Zac Efron, driving over 100 miles per hour in an Audi R8 at the Infineon Raceway in Sonoma, Calif.
Sorry the pics aren't bigger, if any turn up I'll add them. 100 mph is really pretty tame, no?
Pics Source (via ff) and E! Source
ETA, a little more:
And Zac had this to say about speed:
"The Infineon Raceway is a great course to learn on because it's not what they call like a horsepower course," said Efron. "It's more of a technical course in that you have to learn about taking a wide radius on the turns and the apexes of your turn, which is what I've been learning today."