This is ture, an average journey of 38.6kwhr/100 miles will provide 233 miles at 90 kw. However, when I charge overnight the indicated range is now showing 255 and updates to 261 miles when I start the vehicle. I am hoping for the best if we do a longer range trip.As far as I know, the range estimate the car gives you is based on usable battery capacity vs actual, so the 2.8mi/kWh will give you a predicted range of a bit over 230 miles
The good news is that since we got this car it has consistently declined in range predicted from 237 at purchase down to the high 180's before the last shop go around. My thought is the regen was not working but is now corrected, but it could be other issues they addressed in the last update for efficiency.