I was at the top of Haleakala here on Maui earlier today, and when I got home, I realized that there are probably very few Model S owners that would be able to realize such a scenario. For the 50+ mile drive down from the top to where I live in Kihei, my average wh/m was -104. 10,000 feet of gravity, combined with the efficient regen capability of the Model S, and I had more rated miles when I got home than when I left (106 miles at the summit, 124 miles when I arrived home 1:25 later).