I'm confused about torque sleep on the dual motor cars. My understanding is that it saves energy by using just one of the motors when cruising at a constant speed. Why is that good? I get it that the front motor on the P85D is more efficient than the big one in the rear. So that part makes sense. But not for the 85D where both motors are the same. But there's a more fundamental question here, too. In any given situation the amount of power required to maintain speed will be some fixed amount, P. And that implies a fixed current, I. Losses in the motor are proportional to I^2. But if we divide that power equally between the two motors each one has only I/2 and therefore losses of I^2/4 each or I^2/2 total for both. Using both motors gives the same power for half the losses. What am I missing here? And given all that, wouldn't 4 motors (one per wheel) be even better? And it would save a bit more energy by eliminating the differential and its losses. Plus torque vectoring and stability control would be easier.