4-5K!!! I only wish, much less 15,000 miles. I used to go through a set 207 street compound tires in 2,000 miles so I am now trying the Pilots. On a track day, I usually finish off a set of tires in a day. And most race tires are used up in the sense that they don't grip as well as when new after about 50 miles on the track. I guess I would really skew the stats on this experiment!