25,000 miles on them, low rumble at lower speeds not bad, at highway speeds the left rear seems to howl in a certain speed range about 65-70 mph, I can hear it when I'm up against the jersey barrier especially, goes away when I reach a certain speed, ususally over 70 mph. I figured it had to do with the performance nature of the tires, wanted to check, I feel better now, thanks guys!