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I'd say they're just oversized for use on a car.
Turbulator tape for gliders is (less than) 1mm thick, but AirTabs are 25mm or 1 inch thick as they were intended for use on big trucks !
VGs also add drag by themselves, so you need to overcome that first before you start gaining.
MetroMPG found they smoothed out the airflow on the back of a small sedan.
Red above found them to keep the rear window cleaner (indicating reduced turbulence at the rear).
They were found to improve stability when mounted underneath an Insight (1gen).
But so far, they weren't found to reduce the fuel consumption by EM members.
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