Originally Posted by
erig007
You're assuming that mainly speed can make people burn calories fast but climbing hills and heavy loaded bike too(strong wind too but very easy to control)
No, I'm not assuming that. It's just simpler to do the calculations if one eliminates a few variables. And whether you are going uphill, or on a heavy bike, watts are watts. There are very few people who can put out enough power to burn more than 1000kcal per hour for several hours.