There is no appreciable range improvement by limiting potential for performance. Just because a car is capable of 0-60 MPH in three-to-four seconds doesn't mean you can't drive it slowly enough to reach the mark in thirty-to-forty seconds instead. I believe that it is more important to match the electric motor used to the maximum output of the battery pack array that is used. That way you will have the maximum efficiency possible at all points in the power band. Tesla Motors has already shown that a 60 kWh battery pack capacity can be extremely efficient even with a 300+ HP rating on the electric motor. I believe that General Motors has made a mistake by limiting the Chevrolet Bolt to a 200 HP permanent magnet motor.
Does the model S have an "economy" driving mode that makes it easier to do a slow smooth acceleration? i just wonder how easy it is to modulate the pedal on a Performance car to not get a jackrabbit type start.