I imagine they are based on what Mr/Mrs "average" would burn in a certain time over a certain distance.
However.........On Friday my friend (yes I do have one) used his phone app' and over a 35 mile ride along the trans-penine way it showed we had burned 4200 calories.............which seemed way over the top to me.
Yesterday I did a 33 miler on the road (into Cheshire) and my Garmin-200 showed just 1200 calories........that sounded more accurate.
However.........On Friday my friend (yes I do have one) used his phone app' and over a 35 mile ride along the trans-penine way it showed we had burned 4200 calories.............which seemed way over the top to me.
Yesterday I did a 33 miler on the road (into Cheshire) and my Garmin-200 showed just 1200 calories........that sounded more accurate.