Number of places, and yes, some interpretation.
At 90%, the battery really doesn't go into its final stages of calibration and balancing. Only at full charge will the batteries completely balance and that's also the time that evidently the software goes through some recalculation of what the maximum capacity is.
It's been shown time after time, that charging to 80%, even 90% all the time doesn't allow this to occur. Periodic charging to 100% (not on a Supercharger, and make sure that you leave it plugged in for a few hours) allows all the numbers to reset.
Of course the much better thing to do is to take a trip and use it. Not only does it give the battery a chance to be worth it's money (driving a car 100 miles a day on a 325 mile battery isn't a great use of money), it helps you get over the obvious range and bettery anxiety that you have.
What's my max range? I'm really not sure what it has been recently, because I don't worry about it. Every time that I checked, I've had no degradation. That's over 18 months on my Model 3 and 2 years on a 2018 Leaf and 3 years on a 2015 Leaf. (with only 3% degradation).
I just drive and enjoy my car at 28,000 miles, mostly trips that I barely think about the battery and charging on.