Originally Posted by sreten

Was the medical study in there somewhere and I missed it? The Harvard Study said there is a difference in energy expended because of power to weight. It takes less energy to move less weight up a hill than it does more weight. Cycling and Racing have proven this for years. Colin Chapman was famous for saying as a engineer, "Adding power makes you faster on the straights. Subtracting weight makes you faster everywhere".

The Mayo Clinic Posted this about calories and weight.
Your body size and composition. "The bodies of people who are larger or have more muscle burn more calories, even at rest."

That is from an engineering and Medical point of view.