The Michelins on my car have a treadwear rating of 220, which is pretty low. I expect to be changing the tires on my car around 15K or so. I'm sure I could push them into the mid 20K range, but why take the chance. Once the tire gets past 50% your going to need to change your driving style. I don't know about everyone else here but when I get the chance to take a nice turn, I don't want to think about "are my tires going to work for me this time?" FWIW, when I do need tires, I'll be going to BFG KDW2's that should run me about $1,100 a set or I could go to some Japanese tires I checked into that run about $900 a set, I guess I'll cross that bridge when I get to it. BTW, I seen a Crossfire at a local Auto-X this summer and he was running Michelin "cup" tires and they were P235/P265's and fit nicely in the wheel well, something else to consider...going up one size on the tires!