No idea what my hr is on the commute, but three months or so of commuting nearly every day (25m r/t) has seen my resting heart rate drop from 70 to 60, not far off the 56/57 it used to be before ten years of booze/****/sloth. Not that I don't still get some booze/****/sloth in wherever possible...
My ride in is about 15mph average, home is 16.5mph average. Probably because I'm awake by then. I hate mornings.