Rated miles is a good metric of capacity left in the battery. I live in Colorado and vertical is just another part of driving. You go up, and you have to pay the potential energy piper; you go down and the piper pays you back. That's fine, but I wish that the Tesla cars would just display what is left and not play games. Games you say! For some reason, Tesla cars don't want to show an increase in rated miles until you accumulate a total of three. I first noticed this driving down Mt Evans in my Roadster in 2009 (I think that I may have been the first to take an EV over 14,000 feet.). Going down long mountain grades, there is a lot of Regen going on. The rated miles stays the same, then suddenly jump by three. If you don't get to the magic, three-mile threshold, then the rated miles just don't go away for awhile until the universe comes back into balance. Amazingly, the magic three mile dead zone is in the MS as well (well, occasionally, it is four...). My MS lives most of its life in Pagosa Springs, CO. 30 or 40 times a year, I drive up to Wolf Creek Pass and then back home. There are about 10 miles of regen in the potential energy bank driving to the west, down off of the pass. The bonus, potential energy, rated miles, always come in bursts of three... Why can't Tesla just tell us what is left in the battery? Why do they wait until each three mile increment to show us reality; what is there to hide?