I would add that removing all the drag possible is the best friend of battery range. I myself found a dragging rear brake when checking how many times my MP2 would turn. I swear it wasn't dragging before. Tire pressure is another thing that creeps up on us. Thought my tires looked and rolled/coasted fine. I checked them and they had crept down from 45 to 28lbs. Once filled the bike seemed to roll forever. Guess the moral is check stuff often! Drag eats amps!