So I've been a member and following this forum for years and love Tesla. My wife and I are finally hoping to bring home a Model S in 2016 and I've been looking at some of the CPO cars available. My question is, I know tire wear, especially on performance versions with 21" wheels seems excessive. What type of mileage are people seeing out of their Model S? We love the 21" tires but if we buy a standard 85 RWD CPO car and only get 10-15k miles out of the tires I'm not going to be happy. I'm just curious what the big jumps of "tire softness" are in the different models with 19" and 21" tires.