[aerohead]

I found the "Aerodynamic Effects of Rear Spoiler and Vortex Generators on Passenger Cars",from India.
*It's good that you did some fact-finding.
*Unfortunately for the researchers,they didn't understand what they were doing.
*A 1/15-scale model requires a minimum 300-mph air velocity to test.
*The model blockage ratio way exceeded the 5% maximum.
*Surface details this small cannot be analysed with anything below a 1/2-scale model.
*Nowhere do they claim to have eliminated the wake drag.