That should help the battery range during long highway use. Smaller the Cd, the less required HP to overcome the aerodynamic drag, which is the majority of where the power is going to move the car while at a steady speed.I'm sure you know Teslas are incredibly slippery. The Model 3 has a drag coefficient of 0.23.
The new Model S is the world's most aerodynamic production car, with a coefficient of drag that's just 0.208.