If all the responses were about Bravos using the same battery voltage, you could start to compare range experiences with batteries of the same Ah. Otherwise, you'll have to compare on battery watt-hours (Wh), a measure of the total electrical energy stored. That's the commodity you're actually draining when you run the motor.
To get Wh from Ah, you just multiply the Ah by battery voltage — the implication being that you can ride longer with the same Ah at higher voltage, and vice versa. For my 48V, 20Ah battery, 48V x 20Ah = 960 Wh.
After 8 months and 1,400 miles on this battery, have only the vaguest notion of its full range. With the varied terrain around here, it's probably good for 60+ miles in the hilly parts and at least 80-90 mi on the flats.
However, I've never ridden far enough to put those hunches to the test. And at least 95% of those miles were at PAS 1/9 with a blip of throttle now and then. Other people will ride differently. Plus, some bikes will turn their stored Wh into distance more efficiently than others.
Unfortunately, many of the ranges you'll see quoted here will be at least that shaky.