Sorry I was talking about the wrong tyres, gp 4000s. I use them on my best bike I've got about 2200miles out of them and just 1 p'ture (and that was when somebody sprinkled 1000 carpet tacks along the Etape Caledonia route) but I only use them in summer and weigh 9.5-10stone, my brother who is a few stone heavier has the same tyres and suffers more.
I used to use 4 seasons too, I think my first rear got 3,500 miles without a p'ture, I expected it to come but it never did and I considered them too worn anyway. My second rear I tkink got around 5000 miles with occasional p'tures and then got them nearly every ride at that stage. I think the front 4 season which got moved to back got more miles without failing. I would buy them again without a moments hesitation if it wasn't for the cost.