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Hucho has a nice picture showing smoke flow from the front as it hits the tire. Turns out, the smoke trail deflects ~60 degrees from centerline parallel, outward. This would be due to bow wave where it impinges on the pavement.
You need elliptical deflectors, canted inward (pigeon-toed), as seen in one of the Julian Edger photos. The tire also needs fairings behind the tires, to smooth the turbulent air there. Prius made a weak attempt at this with their back wheels.
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