i'm thinking of getting these tires (305 70 R17) and was wandering how long the tread will last on aveage. I was talked out of the 315's so does anybody run this brand and maybe the tire size, if so how many miles you getting? Most of the miles i will be doing will probably be freeway but i love the looks of these more than the bfg all-terrain but if these tires only last 20-30 thousand miles then i will probably go with the bfg's. Thanks