So I topped up the batteries last night to 81 volts and then took it on an 8.4 mile ride through part of town this morning – presuming the odometer is correct. After getting out of the neighborhood it was a mile downhill at 45 mph (mostly coasting assisted), then about 2 miles at 45 mph with 3 stop lights to destination. The only difference is that on the way back it was back up the long hill.

What i noticed while returning home was that the loud squeal I was hearing from the front of the bike was the sound of the speedometer connection with the cable from the front tire spinning rather hard and vibrating like crazy. Will check it for alignment (unplug cable and replug basically) to see if it will fix.

Anyway, voltage leaving was 81.0 volts, voltage after the 8.4 mile ride was 77.3 volts. This is a difference of 3.7 volts, which comes in at 8.4 miles / 3.7 volts = 2.27 miles / volts. Roughly a range of 38.59 miles with a low cutoff of 64 volts. Need try longer, just not keen on finding out the hard way i couldn’t quite make it home.