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It does look like any type of air gap increases drag however.
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That's my point, although longitudinal ducts appear to be effective (Ford GT40, VW GTI W-650, any late Ferrari), lateral ducts like your wing slots add drag. With tufts in the gap you could tell if the air is rising, falling, exhausting out the sides, whatever. Then decide when and where to block it.
Look how close that is!
Morelli used turbines in the wheels to pump air into the wake of the rear tires. The Vanagon pumps [at least] 1500cfm of hot air under the back bumper. If that was ducted into the wake of the rear tires, Morelli's kludge wouldn't be necessary (except for EV conversions
).
Truncating with a flat plate, a box cavity or a perforated base plate all work to some extent.