That tape is what i was looking for AFTER the wheel, it would help A LOT. But I may use dimple tape instead since it would look much better on the car.
Oh and I have VG's on my car ("Vortekz?) and I beleive that they do work. NOBODY with my car has been able to even get close to my mpg highway rating, even hypermillers. I did some testing (
--- "vortekz" Generators Tested!! --- Pictures!! - GasSavers.org - Helping You Save at the Pump) and it showed MUCH better flow attatchment on the window which only leads to a better simulated teardrop shape.
BUT, i dont think airtabs work because they have way to much frontal area, as "vortkez" are extremley slim and have probably 1/20th the frontal area, so the net aero gain is negative as compared to the "Vortkez". Now if think ZZ tape is even better as it has practically NO added frontal area (But I didnt know about zz tape when I put my VG's on).