I'm amazed at how people get more than a couple of thousand miles of of their tyres, whatever tyres I try they seems to get ripped to shreds before I even reach 1000km (yes I make sure they're running at the right pressure before every ride), I get quite depressed about the poor state of the roads around here, I long to cycle on smooth roads with no glass (or motorists) on it.
I've discarded a pair of tyres after only 120km before, my last pair lasted 550km before they failed.