ICE vehicles have lower range as well when going uphill or exceeding the optimal speed and increasing air drag.
The estimates are based on driving on a flat road at the speed limit.
Even my Lexus SUV can get 24mpg driving on 35-45mph roads vs 16-19 in the city or going to the mountains where elevation increases.
People's understanding of range is just not quite there yet whether it's for an ICE vehicle or an EV.