I want to mention that all this talk about it's better to arrive with less battery percentage and enjoy a longer period of non-tapered charging, is true and all, but in my experience it really doesn't matter in the course of a long trip (YMMV). When we first got our car in 2014 and went on a 12,500 mile (17,000km) trip, initially I was recording numbers, calculating percentages, timing everything, and boy, what a pain. It was more complicated to figure out when I should stop charging at SC.a so that I would be around 5-10% (while still leaving a reasonable buffer in case of rain, detours, whatever) so I could get the "best" charge at SC.b. At most, including the 10-15 minutes of all the recording and calculating, I figure I saved maybe 0 minutes per leg. Or maybe 5 minutes, or -5 minutes.
A lot of angst over, in my view, nothing worth worrying about. Now, I charge to somewhere between 20-30% more than EVTripPlanner says I need as a very comfortable buffer. Sometimes I arrive at a charger with (yikes!) 40% left. OH NO! Except from my get out and have lunch or go for a walk perspective, the car is usually ready before I'm finished anyway. So all the worrying about taper is (usually) moot.
Sorry for the rant. I just want new owners to realize that all the number-crunching really is not necessary; they can just get in their car and drive (I do recommend using EVTripPlanner though, and sending some college support money towards the site owners).
[EDIT] However, it's very important, when you have the choice, to *NOT* pull in and charge to a charger that is paired with a car already plugged in. The pairs are by number (1A and 1B, 2A and 2B, etc). So if a car is parked at 1B, don't use 1A -- you'll only get what's left over from the "primary" (first in) car, and you won't know when they started charging. Your speed will go up as they taper... but if you use an empty pair, you'll get 100% of whatever your car can take from minute 1.