Got a little over 12,000 miles with my Cobra and that was running 38-39 cold. Only about 1600 miles of that was in twisties
I am at 17,500 right now and just ordered a new one. Down to the wear bars. I think I got about 20K on my first one. Not sure why this one did not get as many. I run 40 lbs cold. Will give 38 lbs cold a shot. Probably there anyway.