Heh, in my experience most Americans start complaining if the heat isn't cranked up to 80F in the dead of winter. But come summer, everybody wants the AC cranked down to 60F. T-shirts in the winter and stylish jackets in the summer, nobody dresses for the seasons.

Personally, I prefer an open window. Fresh air is almost always better than warm/cold stale air. But I think that'll kill a car's aerodynamics anyway, maybe worse for efficiency than running the heater/AC.

My driving in the mountains in the winter was in shirtsleeves and bare feet. No trouble keeping the interior of the car warm. Also because it is electric I can sleep in it and be kept warm without the risk of being poisoned by exhaust fumes or kept awake by the noise. There was one occasion when I had to move my car to the other side of the car park because someone parked their ICE car next to mine and left it idling all night while they slept. As this was in an otherwise silent landscape it was pretty annoying.