Finally got the Polar set up on my Mercian which is on the trainer. OK, really I finally got on the trainer for the first time this month and it happened to be the first time I had a speed sensor that would work on the back wheel. Anyway, I rode ETC's Uphill Grind but upped the resistance higher than I ever had. Then, because the Mercian has new cables Bubba kept having to come over to make adjustments while I softpedaled. So, I knew it was going to be somewhat slow but I really had no idea how accurate my past questimates had been. I had previsuly been guessing completely on how my body felt.

Low Resistance but no wrenching sessions - estimated avg spd at 17.3 mph
High Resistance with a couple of extended derailleur adjustments - measured at 16.8.

Just an observation and pleased that I have a pretty accurate gaugometer of my passout levels.