At 20K, doing mostly highway driving, my Conti's went away. Were pretty good up to that point, but once they had some wear, did not like them in rain at all. Spent too much time controlling them. Probably could have pushed these a few more K's had it been summer, but with fall weather and rain coming in, not worth the risk. I don't think I have gotten more than 24-25K from any OEM tire on a Focus.
Rotated and balanced every 5k, proper inflation, like all the tires I have ever put on any Focus I've owned. Pirelli, Falken, Cooper, Kumho, Yokohama, Conti, when they went away, they went away quick.
So I decided to try the Michelin's. More expensive, but experience with the others showed me that I would be replacing them again sooner than I would have liked. So far the first 500 have been fine. If I end up getting the same mileage off of the Michelin's that I've gotten off the others, then I will go back to the lesser priced tires. If they all only last the same, why waste the money?