RE: Beating Cruise for Economy?
As ED says.
The cruise is quite aggressive. It is annoying really because a well-designed EV would have the cruise control integrated with the power electronics. You could achieve a 'perfect' speed setting if done correctly (by setting and synchronising the motor drive frequency with the speed). Clearly they have not done that and the cruise is a separate system that sends a [inevitably slighty delayed] control signal to the accelerator circuits.
Anyhow, it is not bad, but will over/undershoot a little. As mentioned, if you go rolling up a hill with cruise on it will suddenly give you double the power before backing off. Not the ideal for economy.
Basically, if you want max economy you can set the cruise if you are on flat ground (eg. south of Rugby on the M1). If you have terrain to go up and down, forget cruise. Pick up a bit of extra speed before the grade, then hold the power steady and allow the speed to drain away. Once over the crest let the speed build up again and then roll off the power gently. Try to stay under 20kW at all times.