I got over 13,000 miles out of my first set of PR4GT's, but only about 9800 out of my last 2 sets of PR4GT's. Just mounted a fresh 4th set this morning. Pretty concious about air pressures, and don't think I am riding any differently. Don't know why the difference in mileages between the first set and these last 2. I got 11K eack out of (2) PR3's and thought the 4GT's would return better mileage (as advertised). At least they haven't cupped like the 3's did for me. A PR2 returned 8K and the original BS was also gone at 8K. Just over 71,000 and I'm on my 8th set of tires. Dang these bikes are expensive to keep up. lol