Mr CC and I get more than 6000 miles from a rear TKC80, and I would say twice that from a front.

That said. you cant just blow them up and never change the pressure for the life of the tyre. If you do this is how you get the centre of the tyre wearing out.

We Drop the rear to 22 psi and front to 26 psi for hard off road riding and then put them up to 30psi front and 33psi for the rear on tarmac.

if you zoom in on the rear tyre you can see there is plenty of tread left on the rear .At this point we would have already riden over 3500 miles . The tread is almost even and we still have about 1500 miles to home.