Forerunner 35.
Ran 5k yesterday in 28.5 mins average HR 143bpm calories burned 385.
Walked 6.2km today in 61.75 mins average HR 87bpm calories burned 469.
So that's 77 calories per km running, 76 calories walking.
This is consistent with many other walks/runs I've done. Could this be correct? I would have thought running should be higher.