Before Abetterroutplanner, no one could tell me the effects on mileage for driving uphill. My request to the dealer was shrugged off. So we left unprepared with 3 people and 250 lbs on board for our weekend trip to Donner Lake, distance ca 175 miles, with an estimated range of 250 miles. No prob, I thought. A/C on, running at 69 mph. We stopped for lunch in Davis, CA. Driving I-80 with plenty of traffic, as is customary. Still maintaining 69 mph, climbing. Eventually, range anxiety set it! I reduced the speed and turned off t, he A/C. That had a minimal effect on the range. Finally reaching Do