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Just by appearance the mirrors look like the would cause little disruption in the airflow. They are away from the body and operate in their own airflow. While their true drag may not be ZERO, it may be such a low number in comparison to the whole car that the effect it had on the electric range of the vehicle was unchanged; therefore it is neutral. They are without a doubt the most aerodynamic, usable mirrors ever seen on a "production" vehicle.
While cameras & screens are superior aerodynamically they hit 2 walls:
1. Most state laws specifically require MIRRORS and would have to be overridden by a federal law permitting cameras.
2. The last thing you want to add to an electric vehicle with limited battery range is another electric powered device. Nevermind the additonal production costs.
IMHO, a few hours in the wind tunnel has yielded the best of both worlds.
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