I managed to scrub the centre tread out of my rear Avon Roadrider Mk2 in about one year of being fitted, so in riding months, say no more than 8, I don't bother to actually keep a record of miles travelled, but I doubt it would have been more than 2k as I also use my Comet from time to time, is 2k miles acceptable, seems a bit lean to me, I am invariably 2up, and carry stuff in panniers, just wonder if I over inflate, but with carrying weight I like a bit of pressure in the tyre, normally around 34psi.