I got 4K miles out of my 275's before one of them got a big cut in it (must have hit something) and they probably had at least 4-5K left. M&H says 5-10K miles depending on usage. I've abused my 325's pretty hard, including some burnouts at Woodward that I should have done on my street tires. I think I'll get about 5K out of 'em even with the abuse. I'm gonna go easier on my next set (at least as far as no senseless burnouts, just normal heat 'em up and racing) and I expect to get closer to 10K out of 'em. They're the same exact compound that they use in their slick, so they're really soft, they're probably about as soft, maybe a lil bit softer than my Hoosier QTPs.