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I rode 134.5 miles over 5 days, and I measured the charge with my Kill-A-Watt.
I went essentially all the way down on a charge - the unloaded voltage was 42.2V (after climbing my steep hill) and in a couple of minutes, it recovered to 42.5V. I wouldn't want to go lower, because I had to pedal very hard to get up the hill, and I had to drop it back to standard mode, because high power was draining the battery quickly, at the end.
It was 44.2-ish and it went down past 43V in just a couple of minutes.
I rode one charge for 135.5 miles! About 1/3+ was on high power mode, because most of it was on rail trails, which are generally flat and have gentle slopes. I also pedaled a fair bit.
I measured the charge with my Kill-A-Watt meter - it took 3.94kWh. Which is a fair bit of overhead loss - the battery is nominally 3kWh, but the charger, and the cells lose power to heat, during charging.
So, the math is 29.08Wh / mile - which is 1158MPGe! Which is really good, obviously.
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