Respectfully, I should note that my post was in reply to a post by "sammy5001". I led my post with a question, "Can you describe the "power meter" you're using? Is it measuring the actual power delivered by your body in moving the bicycle?"

That said, you're right! I got tripped up on sammy5001's original post language, namely "Based on my power meter readings... 33 kilojoules/mile, which translates to roughly 33-38 calories/mile depending on how efficient my body is"

OK, 33 kilojoules is equal to 7.9 Calories (*). If we multiply 7.9 by 4 we get 31.2. If we multiply it by 5 we get 39. So implied in sammy5001's post is the conversion of the raw power meter reading of 33 kilojoules into food Calories using a 20-25% body efficiency estimate.

* Note: I will assume that sammy5001 meant "Calories" instead of "calories", lowercase. A food calorie is actually a "kilocalorie" and should technically be capitalized to distinguish it as such. [33 kilojoules = 7900 calories = 7.9 kilocalories = 7.9 Calories]