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Ack, wrong place! I think... Comparing my Grandpa's Corolla (.3) to his old Camry (.34) the angle from the edge of the trunk to the roof isn't as great and the C pillars curve in to help w/ pressure drag at that part of the vehicle.
I could be wrong, but AFAIK the whole point of VGs was wake infill. Not nearly as great as a better shape, but beter than a kick in the head. I just don't think it's needed on top of the trunk (by putting 'em on the roof). Any chance you could test 'em on top on the trunk near the abrupt drop back there?
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