Thanks Mike for this informative video.
Possibly there is another advantage given by the improved handling -
My understanding is that on an undulating surface, the vertical damped oscillating motion of the car body requires energy which is derived from the undulating surface of the road and the forward motion of the vehicle.
Similarly, sway motion (rolling action) energy of the car is also derived from the road undulations and the forward motion.
The energy is partially stored in the suspension springs but mostly dissipated as heat in the suspension dampers.
If the amount of vehicle body motion is reduced by changing the suspension, less energy is involved in the body oscillation motion and less heat is dissipated in the dampers.
Consequently is can be argued that on such undulating surfaces at a given speed, the miles/kWh figure should be improved slightly by the greater damping effect of the changed suspension.