How does the Audi e-Tron achieve such high efficiency levels in its electric drivetrain?

I am amazed at the long range of the Audi e-Tron, even with its heavy battery pack. How is the electric drivetrain able to achieve such high levels of efficiency?

The secret lies in the e-Tron's two asynchronous electric motors, one in the front and one in the rear. This allows for better weight distribution and optimized torque, resulting in increased efficiency.