Speed and long distance are enemies. You can have lots of either, but not both at the same time. My E-bikekit 48v/20amphr battery has 5 power assist settings, 1-walk assist, 2- 9mph, 3-17, 4-21, 5-28mph. In power#3, its good for 40+miles, In #5- 25 maybe! With a 36v battery, it would...