The numbers in the graph ARE the 100% numbers. My 100% range is down to 282 from 310. When I charge to 100% I get slightly LESS than the 90% extrapolation says.
So I get 282 some days, and 285 some other days. BIG difference from 308-310.
The numbers I see on the stats are the same numbers I see on the dashboard (rounded to the nearest mile)
Since there is a marked/significant difference in the numbers that indicates there is some problem. That may be a BMS calibration or real degradation issue, no way I can tell.
I noted in one of your messages that you often time charging to finish relatively shortly before leaving again. That might leave too little time for the battery to balance fully.
One frequent cause of range reduction is an unbalanced battery. In "Roadster-Days" the recommendation often given in such cases was to time "standard-charging" (approx to 80%) to finish well ahead of departure time - at least 2 hours and to do that as regularly as possible. Balancing would only start after charging had finished and proceeded relatively slowly. To rebalance with that method could take a couple of months, but is of course gentler on the battery than going to 100% and waiting for balancing to proceed from there.