Swabby,
I've run four rear MC II tires, and the least mileage I got was 30,000... yes, thirty thousand miles! I'm on my fifth one now, and it already has 30K and is still going. Good luck.
DDT
No poop ! I never knew that.

Do you run one up front also ?
Rob,
No, the size is a bit far off for me to get excited about. I do have good success with Bridgestone Excedras on the front, though, with mileage varying but usually north of 20K. Since I tend to do lots of miles per year, length of service is essential with me...
That is the best combination I've been able to come up with so far. I do air 'em both up to 45 PSI, then add air when they dip below 40 PSI. Allowing them to run at pressures below 40 PSI seems to hasten wear...
I might also add that I am a very 'mellow' rider! Most of my friends ride more aggressively than I, because it's not about the thrill of speed, acceleration, and peg scrapping to me... I can and have done all of that, but nowadays, I prefer to take my time, amble here and there... take it easy and enjoy the scenery, my thoughts, and my good fortune in life... I am truly proud to be here!
DDT