There are several advantages with two motors -no long drive shaft with separate dif necessary -in a low power cruise one motor can be disengaged almost completely. Reduced drag = more range. -The handling of the vehicle can be improved by controlling the torque on each motor independently. -no need to change all tires all at once like it is the case with AWD vehicles with a driveshaft (tires have to be exactly the same diameter bc they are mechanical coupled and would otherwise start to rub and wear out fast) -Redundancy. If one motor fails, you can often still drive with the other one.