If the design is sufficiently low cost, and since it it wont have drag when free wheeling, multiple motors could be ganged to provide different peak/torque effi

If the design is sufficiently low cost, and since it it wont have drag when free wheeling, multiple motors could be ganged to provide different peak/torque efficiencies. High torque to get off the line and a cruising motor to travel at speed. Given the power to weight densities of modern motors, having multiple compact motors will provide zero weight burden in a car.