Using thin ribbons, I was able to confirm the vortex generators stopped a reverse flow behind the back glass. However, I could not measure an appreciable drag reduction at 65 mph.
By combining VGs with a ginormous fart pipe and 50,000 watts of subwoofer power, I have improved my sex life dramatically.
I was about to make a snarky comments about seeing something like while channel surfing HBO late night and briefly seeing something I don't want to remember on an HBO sex program but . . . we'd probably all get banned . . . if Rube Goldberg had invented a . . . marital aid?