OEM rear went 2500. Was going on a trip and replaced the front and rear with non-OEM Supercorsa SPs in stock sizes. OEM front looks like it might last another 1000. New non-OEM front was done after 1500 miles of aggressive street riding. It had been mounted backwards by a local dealer. First time I've ever worn a front out faster than a rear. Wonder whether being mounted backwards had anything to do with it. Rear went 2200 before it got a puncture. Probably would have made 2400 miles. Non-OEMs worked fine, although I did notice that after the front was changed without the changing the rear, the traction control seemed to think there was loss of traction in tight low speed turns. I assume this reflects how sensitive the traction control is to differences in profile (new front with worn rear).
The dealer said the OEM and non-OEM Supercorsas are different in terms of profile and compound.
BTW, I tried to buy a Supercorsa front from Wheelers last week and when I called they said they didn't have them and they coudn't get them. Some friends of mine who went there to meet me said that when they asked, Wheelers said they had them and they say they saw them at Wheelers. I didn't go to Wheelers, after they said they didn't have them and ended up getting a non-OEM front at Rider's Hill in Dahlonega. NPR couldn't answer the question when I asked whether they had OEM Supercorsas or non-OEM Supercorsas.