How about some real-world tests? Somewhere other than the sunbelt?
Drive from Rapid City SD to Casper WY on a cold winter day (-20, windy) or from Dickinson ND to Fargo.
Call when you run out of juice.
Flat terrain, warm weather, low wind estimates are just not real world indicators of range, at least not in the Northern Plains. MY problem with this sticker mileage nonsense is that if someone naively buys a vehicle thinking the range for a charge is correct for their driving conditions here, they will likely experience far less range, and that could be deadly in areas where population densities are low and towns far apart.
Yes, Virginia, it is a matter of life and death.