Just be sure to note the caveats (cold temps, low SoC, etc. can throw off the calculations). But if you exclude those cases it will line up with SMT very well.
I agree with this, as a principle.
I have compared the BMS data via Scan My Tesla very many times so far, and also done this at lower temps and SOC down to 40%.
Ive still got as good results despite low temps/low battery temps.
The only thing that I think really matters is low SOC, because with low SOC the resolution when using SOC in whole percent can give big errors. Per definition, if we stay above 50% SOC, the error would most probably stay within 1%.
(Why the calculation stays good/fine with low battery temps? I think, the BMS do not change the [Nominal full pack] value when the batttery is cold. Calculation might be done as Range = (SOC/100 x Nominal full pack)/ consumption. Which means that even if the BMS miscalculates the SOC due to cold battery, the backward calculation we do end up with the value för Nominal full pack.)