Short story: Same driver (me), same course, same day. I had many runs with my F-Stock Camaro with Hoosiers that I have been autocrossing for years. I rented a Miller Motorsports Park racing Mustang (ESPish level of prep, but on street tires), and beat myself with just 2 laps! Here is the full story:
http://www.explodingdinosaurs.com/mustangcamaroax/
1994 Camaro Z28 FS