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I just got mine on last week too. The tread wear rating on them is slightly higher than the stock Potenzas (220 vs 140) so you should expect a little more mileage out of them.
I got 18K miles on my rear Potenzas and they're down to the wear bars. I would expect to get 24 to 30 K miles out of the PS2s as I won't be AutoXing on them like I did the Potenzas.
I got 20k out of the rear with 440whp, I still have the fronts on and they are at 26k and have plenty of tread left. Im waiting to put on my new set as soon as the rear wears down.