Before I got the PTap, I think I had a pretty well calibrated RPE. Well, for this morning's commute in a pre-dawn thunderstorm, I couldn't read the head unit at all, so I decided to really concentrate on RPE and see how close I could get to Friday's commute.
Well, I was w/in 2W average for the final stretch (330W Friday, 328W today). VI of 1.0 with the PM on Friday, VI of 0.99 this morning using RPE.
Cool -- PowerTap = RPE calibrator
Friday (PowerTap paced):
Monday (RPE paced):
That bobble at ~19:20 was due to some construction-related pedestrian traffic and a parking big-rig on the road.