We may still have many things we can do to improve the efficiency, but the efficiency pretty close to 100% already, with Tesla hitting around 94% in their motor

We may still have many things we can do to improve the efficiency, but the efficiency pretty close to 100% already, with Tesla hitting around 94% in their motors. So not a lot of room there. But of course there is still room to shrink the motors, make the motors lighter, make the motors have more power that can be sustained over a broader range of speeds, etc. But the motors are already not super heavy or big by automotive standards, so the net benefit of those improvements are not so great, at least in normal sized cars. The biggest thing I would like improved is the range of speeds at which peak power can be sustained. In my model 3, I have around 500hp at low speeds, but it starts tapering off after 40mph or so. The model S plaid reduces this tapering by using more motors, which allows different gearing so the optimum motor speed is hit at a higher vehicle speed, and a bit more voltage.