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So, does this mean that the air is staying attached too far down? If so, what do we do to eliminate, harness, reduce, or improve it, what ever is the best case. I've gotten a bit better mileage since i added my VGs at the top of the rear glass, and can certainly see their effects in the mist patterns down the glass, but the increased mpg could be learning better driving habits too. I've wondered if there were better placements for them, but I don't have a 3d model of the beetle or powerful enough cfd software to do much virtual testing on something that large.
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