Summary: Toshi is fatleticThis year I made it out 19 times (will be 20 this weekend) and I do far fewer miles than you, 7-10 miles per pop typically. On the other hand, I'm fat, hit things hard, and those 7-10 miles usually have at least 1400 vertical associated with them, because Colorado.
I am guessing being 80% torso you have large lungs that can handle that thin air?