am) 9 miles, average HR 154. I wore my monitor but ran by feel. I included 3 X 10" max effort hill intervals. I didn't walk at all and was pleasantly surprised at my average HR... I really thought it would be much higher.
Lance has been training in Kona a bit. Here's a link to his pictures.
In the International Journal of Sports Medicine there was an article on the effects of compression tights on trained runners. They found that full compression tights (vs. the runners 'daisy duke' short shorts) cut oxygen use by a full 30%. For a 3:30 marathoner this adds up to 6 free minutes gained.
They attributed the advantage to more effective blood return to the heart and increased running economy. The tights (and I've already heard of this) may increase your awareness of your legs which allows your brain to feel your legs more effectively. Simply by being aware of leg movement you increase their economy.