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As far as coanda nozzles and such, I need to do more research to say anything about that, but it sounds like a good addition.
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The Coanda effect is provable, used mostly in industry, and hasn't been applied to cars to my knowledge.
Do you see the 'stinger' that stores over the roof of the van? Imagine it was concave, with a [forward facing] baloney-cut upright pipe at it's focus. What that would do is add an energetic jet to the center of the wake. Hopefully shrinking it.
Theoretically, anyway. My panel van was half-way through a restoration when I let it go.
Of course, this could be reduced down to something no longer than those big rig 'trailer tails' (which only treat the top half of the wake so they can back up to loading dock).
Speaking theoretically again, a differential manumometer need be nothing more than a long piece of surgical tubing with a downward facing U-bend in the middle. A bubble of liquid in the bottom will be driven up one side or the other. For comparison, not
absolute values.