How long are the Michellin PS2 meant to last?

I have the 19" Carrera Classics with the Mich. PS2's. I am also running nitrogen filled tires.

I run about 34.5 PSI in the rear and 31-32 up front. It is amazing how a 1/2 pound pressure difference impacts the "bite" in the rear end for high speed cornering.

I use a digital tire pressure gage too. Very accurate.

I have 7,100 miles on my tires. 99% highway driving and my tread looks great. When they were new the tread depth was 10/32's all around. At last check, I still had 7/32's in the rear. It is my understanding that the front last much longer.

I expect to get about 15,000 good miles on the rears before replacing.