I can't speak for anyone else but..
I got 30K out of a set of Michelin MXX3's. Lots of auto-x's on them; the rears were just about to wear bars, the fronts had a bit more tread but the shoulders were gone.
I'm guessing 15-20K would be more reasonable depending on how you drive. The rears will definately wear out before the fronts.
Keep in mind this is based on using maximum performance summer tires rather than some touring tire with a wear rating of 400+.
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