Interesting, however what the treadmill actually measures is distance x incline %(with your bodyweight factored in if you add it, which i will) and it measures the amount of work performed in energy(calories) in other words, how much energy(calories) does it cost to perform 1 hour of jogging on the treadmill...the reason you would add your bodyweight in is because it requires more energy for a 300 lb person to run a mile, than a 185 lb person(pure movement of excess weight), hence if you did the same amount of actual work at 300 lbs. you would burn more calories because you are pulling a larger mass(your body weight). Thats all I was saying...
Thanks for the article, you learn something new everyday!