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Here is my understanding of it.
Vortex generators will do absolutely nothing on the trailing edge of a vehicle. The whole purpose of the vortex generator is to basically slow the air down and create a thicker boundry layer so it can follow a steeper angle such as a rear windshield. This increases pressure on the rear windshield and reduces pressure drag. The vortex generators are not going to slow the air down enough to make a near 90 degree turn to put pressure on the backside of your car unfortunately.
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