so far the front tire on my GT has lasted for 10,000km, it will go a little more but will need changing soon, the rear tire was at 6000km when i changed it, picked up a spike and it took two tire plugs to stop it, no thanks, but without the puncture i would have gotten about another 1000km out of it.
The front tire on my Touring lasts about the same, and the rear tire i usually get about 8-10,000km out of it. Admittedly, on both bikes, I take off hard most of the time, sometimes it is brake hard into the corner, then power out hard sometimes with the backend breaking loose and going into a burnout, street racing/dragging, and lots of burnouts with the touring, it has no nanny controls and just does them so effortlessly and you can make it go as short or long as you like, i don't mind buying tires, i get my fun out of them