I'm not sure this is all that interesting, but I accidentally charged my Model 3 to 99% or so yesterday at work (I forgot to set the 90% limit, and it said it would be done charging in 5 minutes when I got to the car, so it was quite full) and the rated range was 315 miles.
It’s normal for brand-new Teslas to max charge a bit higher than rated range. My S85 is rated 265 miles but brand-new was showing 272 for the first weeks.
I think it’s because the initial battery degradation happens pretty quickly and then stabilizes at the actual rated range, and Tesla accounts for this behavior when advertising and setting expectations.
Four years later my S85 shows 255 on a full charge. I usually charge to 80% and do a full charge about a dozen times per year. I suspect actual degradation is a bit worse but software improvements may have made the car a bit more efficient.