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John, I think that one of the big differences that sets the Maxxis tires apart from some of the other tires out there is the tire construction for the tread. The Maxxis 8008 employs 3 polyester cords, two steel cords, and two nylon cords. I'm not sure how this construction for the tread affects the "guesstimate" of 10% of tire derating per year, but it may just throw that guesstimate off by some amount. Just some food for thought.

And it probably goes without saying (but I'll say it anyway) maintaining the proper inflation in the tires as well as limiting the UV exposure time, goes a long way to preserving the tire longevity.