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Old 01-14-2013, 06:10 PM   #9 (permalink)
aerohead
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wind noise

The original mirrors probably produced wind noise which was deemed unacceptable for the production car.
The VGs can alter the resonant frequency of a structure,moving it up or downscale out of the range of human hearing.

I don't think it has much bearing on mpg.
Acoustic, anechoic wind tunnels allow manufacturers to address these issues of Noise,Vibration,and Harshness (NVH) which is a standard procedure for modern auto design.
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