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i once read in an aero article (can't remember where) that the majority of "aero optimisation" done by carmakers is aimed at noise reduction, in case of sidemirrors this often means they're set up to deflect the airflow, away from the glas and onto the door surface, as glass will transmit noise better and is right next to your ears.
if the vg's work as they should they migth produce a smaller wake with smoother flow wich is both good for aero and noise.
on the other hand the lack of noise is perhaps not totally equivalent to good aero as certain mirrors might be designed to deflect turbulence away from the car
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