09 with stock IRC tires:
Had to replace the rear at 7500. Switched it out for a stock 08 tire (Bridgestone BT45) which was obviously way better.
As for the front tire, I'm nearly at 15000 miles and am about to replace it for the first time. I will go the same route as I did with the rear and put a BT45 on there.
The rear BT45 is just as worn as the front so I'll probably replace both front and rear.
You can probably tell a lot about my riding style from this information. I haven't had nearly as much time to get out in the twisties since I replaced that first tire, so it's been mostly street/freeway riding. (the rear is a little squared off)