I went 67 miles on EV, going up and down the hills around the lake. 1.8 to spare but probably could have hit 70 (had to make a stop off a several miles from home and didn’t want to run on engine.) I’ve heard that lower oxygen at higher altitude = less drag. There’s also little wind and, of course, lots of regen going down those hills. I’m pleased. I am not so pleased by the intense burning plastic smell that came from the engine as we were ascending from the Central Valley...dissipated after a gas stop but added to my anxiety about this car’s ability to perform under strenuous conditions.