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What about A-B-A with zigzags on your mirror and A-pillar. The MPG difference might not be quantifiable, but doesn't moving air make less noise when it is attached?
Make a bunch of zig-zags and run a narrow strip of tape behind each of them. Then you could do A-B-A-B-A forever, putting zig-zags just ahead of the strip, and measure wind noise.
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