This one comes to preferences, and some people are more bothered with doing without one thing than another. I think it conveys something a bit worse telling people they need to drive with the heater off (being uncomfortable) to keep their speed up, rather than having people use heat and be comfortable while just having their cruising speed be lower.With a full charge and the heater off I completely believe he'll make it going mostly 80, slowing down on the hill climbs.