Everyone seems to expect the dual motor Model 3 to be more efficient than the RWD just like the Model S (5% efficiency gain). However the Model 3 already uses a more efficient permanent magnet motor so it seems like there might not be as much to gain by having a second motor with different gearing. Do permanent magnet motors have more loss at zero load (torque sleep?) than the inductive motors? Maybe they could gain efficiency by having a smaller permanent magnet motor and a small inductive motor. Thoughts?