I have done several rides using a 24 volt 500 watt cyclone motor with a 30 amp battery. I believe using 36 volts you may get more than 1 mile per amp however with a 24 volt system 1 mile per amp is good. It is difficult to compare because some don't peddle. others use their electric system to varying degrees. I just did a 30 mile ride only slightly using the electric for the first 10 miles. The next 20 miles were almost completely electric assist. At the end of the 30 miles my battery was still felt fresh. If I had not peddled at all the 30 miles on the 24 volt 30 amp battery would have completely drained it.

It just depends on how much you peddle and the conditions of the road bike and weather.