As expected in the winter and my daily ride, I have experienced very low milage. Now that the winter is over and temperatures rise, I’ve expected longer range. However, I’m not. Here’s the story. I ride in NYC over a bridge back and forth daily. There is an approx. 10º incline for 1 mile both ways with a total 7 miles per day. If I’m lucky, I’m getting 10-12 miles range. Full charge of 58v drops at least 5 volts when hitting throttle whether on incline or not. Is this normal and if not, how to improve. And,… by the way, I ride fairly aggressive averaging 30-33 mph. thanks