What I would really like to see is a constant power cruise as a second option to constant speed cruise. This way, the car will speed up downhill and slow down uphill. The power setting can be changed (just like a throttle setting for an aircraft) to produce a certain reference speed as the driver chooses for the driving conditions. Constant power will optimize the range of the car for a given power setting. Once up to speed, the lower the power setting (ideally at the "0" or neutral setting in the power circles display) the longer the range. A constant speed cruise wastes power both in the uphill and downhill phase (by using regen). Minimizing regen and using just the right amount of power would be the way to go IMHO.