I’ve been running 21” Michelin Super Sports for 3 summers across 2 X5Ms.
Though I have acquired the tires used, the projected life on those is a bit better than your A/S set: about 10-12k miles. Rears wear faster, so I can generally get more longevity out of the fronts- not a ton more though.
I feel as though I drive it in a spirited manner, though I can’t recall any tire squeal. Those puppies just stick.
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'01 740i Sport; ‘06 Z4M Original owner, no mods
'14 Lotus Evora S; '13 Subaru BRZ, track & autox car
Sold/totalled: E46, E39, 2 E53s, 5 E70s, E31