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Ugh......VG's are borderline unicorn corral material. Airplane aerodynamics do not matter much for cars & trucks. Besides, by the very nature of flight, if you increase lift you increase drag....Think about that. If you came up with something that increased lift AND reduced drag you could have airplanes powered by 50 HP engines flying at 500MPH getting 60 MPG.
The only way to reduce aerodynamic drag is to change the shape of the vehicle, adding things that stick out increase drag. Any benefit from the vortices will only be a tiny bit better than the drag created, at best, and only in very rare circumstances.
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