My Roadsmarts are doing well.
Modest squaring off do in part because our roads don't have a lot of twisties and also because I don't push it like I used to.
I have become almost anal about checking pressure-at least every other week.
I think 3500 on them and they look good.
It has been my experience that tire wear is more about the road surface than any other single issue (assuming proper inflation). Some states use chip & seal processes heavily as opposed to blacktop or macadam. Chip & seal roads will kill tire life quickly. I have friends in GA riding C&S and only get ~5k on the front and rears. Very little C&S in KY and I only use PR4, I get ~17k on the front and ~14k on the rear on my last set. I also have found that if I balance both the tires I not only get a smoother ride but virtually no cupping and I believe they last longer. What I do see is more wear on the left side of the tires than the right. I believe this is due to the road crown and driving on the right side of the road.
I'ts not really road crown - it's the fact that left turns are ALWAYS longer than your right turn. So you end up with more "left" side wear than right... The opposite happens in countries like the UK and Thailand; in Thailand I always wore down the right side faster than the left - because we drove on the left hand side and the right turns were long compared to the left - and there was basically zero crown on the roads (one slab across).
As for MPG, I am all over the place with anywhere from 50's to high 60's. It is hard to tell if the tires have anything to do with it. I think the gas a lone has more to do with it, in colder temps the gas has a mix of things in it that is not the same as warmer temps. Plus here in the Hudson Valley you can go south and get one brand of gas and then ride North and get that same brand with a deff make up. 10, 15% or just plan reg. gas.