I regularly make it from my house in Pagosa to the Supercharger Silverthorne, CO and back which is 237 miles over 3 mountain passes (Fremont, Poncha, and Wolf Creek). One time with 20-30 mph headwinds, I arrived with 0 miles left, but usually arrive with 15-25 miles left in the pack in my P85, and that would be more if I didn't pick up the pace when I knew I could make it to the end. A range charge for me is usually 260-263. There are two big differences that help me. First I drive VERY conservatively until I know I can make the goal by driving the speed limit or 55 mph, whichever is less. The second big difference is that my average altitude on the drive is about 8,000 feet. The air that I drive through at 8,000 feet is about 25% less dense than sea level air. Because effective (indicated for pilots) airspeed scales as the square root of air density, that means 55 mph for me produces the same aerodynamic drag as 48 mph at sea level.
This kind of driving takes patience, which is why I'm working on a 70 Amp J1772 in Salida, CO, for a break and top-off about 2/3 of the way from Pagosa to Silverthorne. I can't be patient for too much longer..... :wink: