All-wheel-drive Tesla electric cars rated more efficient, but how?

2015 Tesla Model S 70D in new Ocean Blue color

One of the myriad advantages of electric propulsion, we’re told, is the efficiency of all-wheel drive. The AWD versions of the Tesla Model S, for example, are rated as more efficient than the rear-wheel-drive versions of the car. This flies in the face of 100 years of automotive history, during which vehicles with gasoline or diesel engines… …read more