Sorry. I still don't get it. It doesn't look like a "formula" to me. It looks more like a result of a computation. Where does that take into account weight, gender, age, speed, climbing, etc? There's no difference between a 30 mi. ride at 16 mph and 3,000 ft. of climbing and a 30 mi. ride at 10 mph with 1,000 ft of climbing? Anytime you ride you burn 33 cal/mile?