I agree. Air availability issue. I run 120 easily and get there fast. (according to my optomistic speedo) I am at 2,000 feet elevation though and there is a big difference between 2,000 and 7,000 feet as far as air density goes.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!