In 2009, I got 5000 out of a Specialized Armadillo 700X25. Lots of climbing and riding on the road as well as trails. Not one flat!
Funny thing is that clydes avoid the tires cause of their weight.
I use Sefs Seca tires from REI ($24), I get about 3000 miles. First tire never flatted. Second , no yet with aobut 2000 miles. Funny thing, I know some clydes that own't ride them because they too are too heavy...from what I've heard!