The beautiful thing is that, when I'm driving, anytime I tap the supercharger button on the screen and click on a nearby supercharger, the car will precondition the battery on its own for maximum charging efficiency. I don't have to do anything!
for road trips, I just type or say a destination and the car figures out if, when, and where it should charge to minimize travel time, and it automagically preconditions the battery on its own. My usual experience is that I arrive, go to the bathroom, grab a drink and a snack, come back to the car, and voilà, it's added 120-180 miles of range.
1. You plug the Supercharger into the navigation system, so it knows it’s going to one? If you just hit up a convenient stop, it won’t.
2. Your trip to the Supercharger is long enough for it to matter. If it’s nearby, the preconditioning doesn’t seem to get it warm enough by the time you get there.
At least that was my experience in a rental.
In practice, I just type or say destinations and let the car figure out if, when, and where to supercharge.