There was an earlier post regarding calories consumed. One respondent suggested that 500 per hour for cycling and 300 per hour for walking was a good figure to use for average/good cyclists. So your value doesn't look too unlikely.

I gave up running long ago believing that cycling is far better for one's body as far as impact is concerned. Seems that my reasoning was scientifically sound. So I always recommend people to do cycling instead of running. I remember reading a recent article where a surgeon stated that he was doing many more hip replacements for 40/50 year olds - the reason - jogging! Mind you I have to admit that cyclists typically stand a greater risk of being mown down by a large vehicle.