Shock-On-T
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"very inefficient" and "much more efficient" are probably stating it a bit strongly.this is only the case because of model s very inefficient induction motors where gearing outweighs the extra drag and weight from the front motor. the model 3 rwd has a permanent magnet motor which is much more efficent and has also inefficient torque sleep. that means what you get about 10 percent LESS range in a dual motor car. considering how bad supercharger coverage is in australia and the lack of rural DC charger coverage this is huge. i wonder whether for australia the RWD might be available on special order. it just makes sense.
From what I've read, both induction and switched reluctance motor types are over 90% efficient, like 91% and 94% efficient.
The reason the reluctance motors are used in the M3 is more because they are cheaper than the slightly better efficiency. They are cheaper because they don't need magnets or windings in the rotor, just plain steel.
The reason reluctance motors weren't used in the S and X is because they are very hard to get right (require very fast switching), and have a problem at max output called 'ripple torque'.