I've managed to put about 14.5K miles on since June and all the treads are looking pretty good so far. They are Goodyear GS-D. There's about 1/8 inch until the wear indicator is completely exposed on the rear tires...a little bit more on the fronts. I am expecting to get pretty close to 20K miles (after a tire rotation) before I'll get new tires. I'm pretty happy with the GS-Ds -- I'm not getting "significantly less than 20K miles" of wear on, as warned by Lexus. And I tend to drive about 50% aggressive, 50% conservative. Pretty good formula considering how many miles I've gotten out of them so far.