I think that you are a little pessimistic about the tyre wear. I have had 2 XT660X's and sure I ride only on road and mainly solo, but I have had 8500 kms from my first bike before I changed tyres and the current one is at 6500 kms and plenty of tread left. I find that Pirelli Diablo were great for feeling but probably not for total kms. Good luck Simon

__________________
(Now sold on, sob) 2011 Blue XT660X with gold wheels, was 26,500 km.
Engine mods: K&N Stage 1 filter, DNA Stage 2 filter, snorkel removed, Kev fuel mod fitted.
Plus: smoked Puig screen, Yam aluminium sump guard, Yamaha / Acerbis handguards, Givi Trekker aluminium side cases, Leo Vince X3 cans plus Kev front fork mod and Fender Xtender. Just fitted Michelin Road Pilot 3 tyres.

SOLD the XTX for a Super Ten 1200. And just bought a Raptor 700 so staying on here for some tips....