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I was about to say the same--not sure what you could glean from pressure-testing that device which you couldn't ascertain more easily and immediately by simply measuring drag.
Tests I would be interested in seeing:
-base pressure variation, on both Insight and Mercedes--is it uniform or variable based on location? Does the base pressure fluctuate with time or is it steady?
-pressure change on the Mercedes' roof with a spoiler (after seeing what happened on a fastback, I'm curious what a notchback does)
-pressure change under the Mercedes with a spoiler
-pressure change on the boot lid and backlight with vortex generators along the roof edge (I don't think I've ever seen this measured aside from the Mitsubishi paper and they didn't show data without their wing)
I'm sure I'll think of more, but that's off the top of my head.
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