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I think people tend to lose sight of the big picture when talking about VG's and Ziggy Tape. The air at the skin of the car is only a tiny fraction of the air that is being affected by the passing of the vehicle, certainly the air at 3 to 4 feet out from the sides of a vehicle is fully in play, and for many tens if not hundreds of feet behind. It is only by gross management of this air flow that we can expect significant gains, meaning changing the shape of our cars. Screwing around with the already "Turbulent Boundary Layer" is a piffle compared to the huge amounts of air that are important to what the overall Cd is on the car.
This is my primary reason for saying VG's & ZT's on cars are a waste of time when trying to achieve any real gains. Fun to think about I suppose, but in the end you need to visualize the thousands of cubic feet of air that are moving up, down, to and fro, and ask yourself if something sticking up a few inches tops is really gonna do anything.
Clearly the VG's & stuff are great for airplanes, I understand that. But again it is because you're dealing with airflows on wings which is laminar by nature, car aero is seldom laminar.
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