Learn a little about mechanics of a normal car first. Anything that works against the motor, will cause them to draw more current to maintain the same speed (more fuel in a petrol.) That's why regenerative braking is the most efficient means of charging the batteries as of now. Just need a couple solar panels well integrated on the car or two small low drag wind turbines up in the typical radiator position (ford gt, ferrari F50 style) might prove worthy :/ LOL

Awesome car though and an awesome start against the injustices faced with the EV1!