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Testdrive raises some valid points. I'd also be reluctant to conclude anything from the flow illustrator demo because for another thing, the free stream flow seems to be entering from above instead of straight ahead, flowing downward at an angle top left to bottom right. Not sure why. But that would mess things up too.
To confirm, all you need is a single row of tufts taped across the last 4 or 5 inches of the trunk, and some way (or someone, if your mirror doesn't show it and you don't have a vid cam) to watch them from inside while you drive. If they're streaming back, you've got attachment. If they're swirling around randomly, you don't, and your Kammback is going to help even more.
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