MartinAustin
Active Member
The only reason the Model S with dual motor is more efficient is because they are using the old, power optimized, large rear motor and then a newer, smaller and more efficient front motor.
I don't think that's the exact reason that dual motor is more efficient. The reason is, you can turn one of the motors off when the car only has to cruise along - like, using cruise control. When you need bags and bags of torque, you can turn on the other motor.
It doesn't matter if you have motors of different sizes, or the same sizes, or the motor you turn off and on is the front motor or the back motor. There will be an energy savings when you turn one of them off during cruising.
Now, Tesla is gaining experience with this technique that no other car manufacturer is gaining right now. The P85D has motors of different sizes. I believe the 85D and 70D use motor pairs whose power is identical front and rear. (though more powerful in the 85D, naturally) Tesla is gaining real world experience across thousands of cars of both types of configuration. When they do this in the Model 3, it will be "next-gen" energy efficiency during cruise.
I am also in the camp that thinks the base Model 3 will be RWD for cost reasons. AWD will be an option on most of the other variants in the range. When we see who is right... I think everyone will be happy no matter what