A big remaining inefficiency in the model s is the limited amount of regen you can capture from the rear wheels before they lock up. Since the strongest braking effect comes from the front wheels the strongest regen would come from the front wheels as well. They really need to do a awd or front wheel drive car to capture more of the braking energy as regen.
Converting all that kinetic energy into brake dust and heat from applying the regular brakes on top of the regen when need to stop quickly is a waste.
Converting all that kinetic energy into brake dust and heat from applying the regular brakes on top of the regen when need to stop quickly is a waste.