I'm afraid you are applying flawed logic.All very encouraging I'm sure but my point remains regarding the efficiency of a bike.
"A human being travelling on a bicycle at 16–24 km/h (10–15 mph), using only the power required to walk, is the most energy-efficient means of human transport generally available."
https://en.wikipedia.org/wiki/Bicycle_performance
It does follow that if burning up calories is your aim then there are more efficient ways to achieve this than bicycling
All the above means is that you will travel FURTHER if you burn the same calories (and the effort you put in is under your control). And as others have alluded to, its far more interesting getting out and about and seeing a wide range of things (or travelling to places you'd otherwise have to use the car for), than say a slow, dreary, distance limited run.