The air velocity as measured relative to a parked car is not relevant to EV range. When the vehicle is moving the relative air velocity is far different than what it is when parked.
And doesn't the heating load of the cabin increase as the air velocity over all of its metal and glass surfaces increases? Isn't the shell of the car essentially a giant heatsink with a 70mph relative wind moving across it?
However the speed of air over the car while driving is unrelated to the airspeed that meteorologists use to calculate the wind chill in your local weather report