The are the best bang for the buck for both track and autox. I drive mine to the autox with the Kumho's on it...very handy due to the 50 treadwear rating. I cart them up in the back of my car when I go to track events. I plan to get them to last about 1/2 to 2/3 of a season (doing about 12-13 autox events...and 6-7 track days)