Here's my real world experience, it's not nearly as scientific as some of you guys.
I charge to 80% at home, do my 9 mile commute, then charge again to 80% at work for the ride home.
I'm middle aged, forty pounds overweight and pedal as hard as I can mostly in S mode, takes me about 35 minutes, so that's around 15 mph.
I usually arrive with about 46 volts left on the meter. I forgot to recharge at work once and it was definitely sluggish getting home.
In summary, the range for a fat middle aged dude who charges to 80% is around fifteen miles going balls out. Sure is fun, and I'm getting faster and lighter every day.