Fact: When properly designed and used, vortex generators CAN and DO REDUCE DRAG.
Calling them "gimmicks" is your personal opinion, not scientific fact. If they were "gimmicks," they would not be used in racing and aeronautical applications.
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Fact: The Vortex Generator gimmicks stick out only 2 inches tops. The small effect it does have will quickly dissipate behind it, it will be simply overwhelmed by the huge amount of air, its effect will only maybe be felt 5 inches behind it and it will only be felt in .05% of the total air moving around the car.
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False. It is well-known to professionals that even small changes upstream can drastically change airflow downstream. A small change as simple as a sharp rear edge as opposed to a rounded one can dramatically alter and smooth the airflow well past the car, resulting in lower drag.
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Fact: By changing the airflow, however slight, the gimmicks WILL CREATE DRAG.
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False. When properly used, they can and will REDUCE drag. Mitsubishi's testing verified this. What testing have you done?
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Fact: The gimmick creates DRAG.
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Only half true. By generating a small amount of drag in the proper location, you can reduce a body's overall Cd. Air dams and tire spats are perfect examples.
Try doing some actual research before you claim "facts." Given, vortex generators are much more effective at reducing lift than drag, but your assertions are NOT "facts."
Does anyone recall the testing of Airtab VGs on tractor trailers? Here's some reading material for those interested:
http://www.marama.org/diesel/frieght...DCAeroOvw2.pdf