Earlier quoted context omitted.
Most accurate by what standard? Range depends on a bunch of factors. The range you got going to the store yesterday is not the range you will get driving to your friend’s house tomorrow. The car doesn’t know where you are going, whether it is city or highway driving, whether or not there is an elevation change, unless you tell it by navigating somewhere. It could take a guess, but that guess still has plenty of chanc…
Why should the car use an average .250 kWh/mi hardcoded rate on a car I have owned for 4 years when it knows my lifetime average is 0.300 kWh/mi? There's plenty of smarter things it can do by default other than "its hard, meh". They are gonna figure out how to do coast to coast self driving this year but can't project a reasonable battery range estimate given temperature/driver history/weather? Do they need more GPUs…
If you mostly drive around town, that estimate will be way off when you get on a highway to go to Grandma’s house.
There’s probably a better way to do it, but Tesla seems to be optimizing for avoiding the “why does the website say 300mi but my car shows 200mi fully charged” support question, in exchange for a different set of support questions.
I think ideally the car would give a best guess estimate, along with a clear breakdown of why this is more or less than the rated range. I just don’t think that’s clearly the “most accurate” option. Most accurate requires knowing where you are going.