Range varies and is related to speed, weight, wind, outside temperature, elevation change and how much assist you're providing, but many individuals state that at 18 - 20 mph, you should use about 20 wh per mile for a 175 pound rider, no wind, flat terrain and moderate pedaling. Assuming your battery is 500wh, you should expect 25 - 30 miles, so if these parameters describe your conditions, 60 km (36 miles) seems about right. I rode 23 miles the other day and only used 40% of a 52V, 4 ah battery or 80 wh, so about 4 wh per mile with lots of pedaling on a relatively flat route with only a little off road (mostly bike path), but at other times my consumption has been much greater, as high as 40 wh per mile at higher speed ascending 3000' on a 7% - 8% average grade in eight miles up a mountain; of course, I used no wh coming back.. .