yes, I get that and the tires/wheels are factored into the 375 mi rated range when new for the 21" arachnids (vs 405 mi for the 19"). I meant that I find it odd that tire wear beyond that would be factored into the max rated range (not actual range) if charging to 100%. Some people still show the same 375 mi rated range for thousands of miles while mine is down 10-15 miles over the same period.
Ah, my apologies. You are talking rated range, and not the range of energy usage. When I saw this:
".... for the first 1.5 months the max range was generally between 373-376. The last 2 weeks has ranged between 362-366 "
I thought that was your Wh/mile energy usage (well, because that is the title of the thread.....) and didn't clue in you were talking 373-376
miles.
You are talking degradation, which has nothing to do with tire wear and increasing rolling resistance; the car (or app) doesn't take this into account for displaying your rated range, as you suggested. It is just good 'ole degradation. Typically Model S will loose 5% the first year and level off, some have been more lucky than that, and some have been worse. And yes some have lost a substantial amount overnight due to a software "balancing" of useable capacity. (But I am no expert; see other threads for more info)
Then again, maybe a few charge cycles from 10% to 98% that will change your rated range and rebalance it? That is what has happened in the past, but Tesla is always changing the software, so who actually knows for sure anymore.
But not sure about the new cell chemistry in your 2021 model S refresh batteries; you are all guinea pigs in that regard.
Why do some people get hit more than others? There is no pattern. It resembles the fact that some people with Porsche turbos got 444 hp and some only got 420 hp, but no-one ever knew that and were able to compare to others because it was never displayed on a screen in their cars, and they all weren't dynoed at the same place at the same mileage etc.
In some ways it is a mistake for Tesla to state the "exact estimated" amount. Less questions and second guessing (and posts) would happen if on the app every car just said "about 330-370 miles", and when it got less than 50 miles of range to being fully discharged it just turns to "red" colour, just like a gas vehicle which means get charge as soon as possible.