(Sorry if this is covered somewhere, but there is no search function and I couldn't find anything related.)
I did a road trip from Mesa AZ to Payson, a distance of 75 miles, and I started with 273 miles indicated for my charge level. I did have the A/C on, and drove the way I drive - fast (80 mph for much of the drive). There is also a 3600 ft elevation gain. When I reached Payson I only had 120 miles showing on my charge level instead of the 200 miles or so one would naively expect - 80 miles less. In other words 75 miles of fast, hard, uphill driving required double the distance in charge. (Going back, of course, I did much better as I was charging the battery going downhill.)
I'm not terribly surprised, and I haven't yet done any long range road trips, but this concerns me as I'd like to have a better feeling about my range capability when I start.
Some time ago, I know Tesla had an interactive program that would allow one to put in all sorts of factors - temperature, a/c on or off, starting location, destination, driving speed, etc., and it would give an estimate of charge level needed. Does that still exist somewhere?
I thought Tesla would have implemented an adaptive range estimate based on recent driving history, driving route, time-of-day, etc.
I'd appreciate some advice as to how to get a better range estimate.