AS I noted prior, tires are very funky to predict; that said, I'm glad you got the life out of them... you actually got a lot out of them. Having said that, and also having much less miles before I replaced them (4k-5k maybe? iirc),and they in my opinion when new, were steller tires.. until they weren't... they, and many other tires will deceive you on "miles left", as once those layers of "durable" rubber scrub down, the softer under layers wear very rapidly... Having gone thru PR's, PR2's, and PR3-PR4 now, I can say without a doubt no matter just how many miles I "think" I have left, they always wear out before that point arrives.. and on the road, and at the mercy of anyplace that sells tires for like 40% more than I buy them online... it makes for a bad road trip.. btdt. Like going on a 2k trip with wife, thinking "no problem, these will last... " and faced with a 2 day ride drinking from the firehose home.. having to get a new tire to protect my wife took priorities, and sucked $250 outta the trip money.. any more, when I plan a long ride, say 2k miles, and look at my tires, and think "i can make it on these"... I change them out, in my garage, and leave home without a worry.. yeah, I may have some tires I peeled off, sitting, but hey... when I have a pal that needs one on a Sunday, we slap it on and he can ride for free.. passing it forward so to speak.