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30k fronts, 15k rears, street driving only but aggressive driving at that.
PSS are nice wearing tires and as long as BMW didn't give it a screwy alignment stock (which they have done before), you'll get 15k out of a set of rears and figure double that for fronts.
Now that being said, it sounds like these are somehow a unique formulation of PSS - else why would Michelin need to produce ~3864 different prototype sets?
So who knows.
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