This was in December in Florida so ambient track temp was not over 90, car ran warm but well shy of overheat. The tires would vary by about 3 psi from cold to end of session and I tended to do about 20 to 25 minute sessions. The wheels were coated in brake dust but I still have gobs of pad left. And... mileage averaged about 4. The car was really rock solid, only things I was concerned with going in was fade and stories of ABS pumps dying when street cars are pushed into ABS too much in too short a period of time; I was activating it a lot more at the beginning but started to get the feel for taking it to just before activation after the first day so I didn't punish the pump too much.