1000 seems a TAD low, most general numbers I've seen on here put the lower end around 2000mi.

That being said, if they're not very good tires they are more likely to wear out faster. If you run gatorskins or armadillos you get a bit more durability out of them.

And you always put your better tire in front, and when your rear wears out, you switch your front to your rear and your new to your front.