The MPGe Tesla advertised also is. Then they use that to correspond to % remaining battery.
All EVs get wildly different range depending on outdoor temps (I get 30% lower range in winter) and their hysteresis is way higher than an ICE car. But, their range numbers are accurate for when they are measured under ideal circumstances.
I regularly do better than rated range. Others have a heavy foot and do worse. Kinda par for the course.
I started playing it right during a divorce and did not keep going. Noped out in the first 10 minutes. I should revisit it now that I’m in a better place.