I autox'd on A032R's last year and have been using Kumho V700's this year. Yokohama lasts a lot longer. Yokohama is not nearly as "sticky" as the v700. I simply could not drive to the events on the Kumho's which I did on the Yokohama's. I can see where the Yokohama would be a good choice for track days. I've never done one, but at the rate the Kumho's are showing wear, I don't think I will get through this year's autox season on only one set. A long day at the track might use up a set.