If you do mostly city driving they will last less than highway. But 9000 is pretty good. I get roughly 7500 miles on mine, all city driving.

If the wear is an issue, first of all, don't get S02s again. Go find something else without the grip and it will last longer. Additionally even if your alignment is not off, you can tame it a little which will help the tire wear.

 

Just had mine checked while "up" for the 7500 mile service. Techs said it was the wear was really even and I had about 2K miles left. (I'm assuming rears, as they are looking worn compared to the depth of the treads.

I do run at 33PSI. And I drive it like it's stolen every time I get behind the wheel.