Notes
At the Silver Comet wearing all three devices, doing 18 miles. The 310xt screwed up right after going over the main overpass at 2.25 miles and seemed not to register any distance for 0.4 or 0.5 miles. It seemed ok afterwards. Therefore I used the 910xt data. I was tring HR 118, but just couldn't keep it down there on the way back. Temp got into the 70s.
FYI: 920xt showed 17.99 miles.
310xt showed 18.06 miles.
910xt showed 18.13 miles.
AVP: (for the usual 17): 12:20.5, AHR: 125.383 AVC: 158.824