I got about 20K miles on my last set of Pirelli 19" sport tires. The worst wear was of course, the insides of the rear tires. I ran those tires at the reccommended 32 pounds of air.

This set I increased the tire pressures to 35 pounds all around and the wear got worse! I guess the harder tire caused the tires to ride on the inner treads even more. I'm at 15K miles and there is no tread left on the rear inside treads. I like the Pirelli's but I'm going to stick with the 32 pounds of air from now on.

__________________
2013 X5 3.5i M Sport
2004 M3 cabriolet SMG