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I never saw any increase in mileage with any of the VG designs I tried. I also never saw any notable improvement in flow attachment on the back window of my Nissan Sentra.
In fact, the only visible flow attachment improvement is on the sides of the car at the back side windows. Tufts there showed that the "Vent shade" on the drivers side smoothed airflow greatly compared to the passenger side where I removed the shade because it was broken.
I want to replace the passenger side one to see if my high speed gas mileage improves at all...
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