Notes
At the Silver Comet doing 15 at HR m165=c168, but devices screwed up the distance. Turned around at 7.50, but knew I was already off by at least 0.6. Trip back measured 7.60, so used 15.16 as total distance.
310xt:
11:19.9 (without distance adjustment) AHR 132.7, AVC 167. using m165