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I was thinking of doing this to my 1971 Beetle. From what I understand this can have the same effect as a golf ball. With a round smooth surface (like my Bug) the laminar flow detaches more forward creating a larger wake behind the vehicle and therefore more drag. A golf ball induces turbulent flow on the surface, which ironically holds down the laminar flow until further back creating a smaller wake and therefore less drag.
Vortex generators basically so the same thing as golf ball dimples. If placed before the point where laminar flow normally would separate from the vehicle's body, in theory they would hold the laminar flow into the vehicle further back and therefore create a smaller wake and less drag.
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