Caloric expenditure - Jogging vs Walking

[Mudge]

The argument came up again on another board as to this being linear per mile based on distance (or speed) no matter how you got there running, or jogging. This goes against the most elementary laws of physics, where friction and gravity are reality.

Walking (2 mph) 198
Jogging (6 mph) 654

Here is an example of non-linear expenditure:

http://pwp.value.net/~fitness/sreport1.htm