I have found that the most important factor to consider for range is speed. If I want to go max speed everywhere I go, my range suffers. If I am willing to ride slow, the motor has to put in less power relative to my own. If I want to go anywhere near max speed, I have to put in a decent amount of effort, and the motor is maxed out, and it is doing most of the work cutting through the wind. The faster you go, the more power is lost in the wind.