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I remember reading many years ago-I think the book was "Racing and Sportscar Chassis Design" by Mike Costin and David Phipps-that it requires 6BHP per square foot of frontal area to push a car at 100mph, and 25BHP per square foot of frontal area to push it at 150mph.
So mirrors would definitely affect the car, and much more so at high speeds.
Probably not a great effect at legal road speeds, though.
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