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I think that based on the NASA van aerodynamics reasearch the leading face of a vehicle, even a completely boxy one like a van, is aerodynamically OK as long as it has 4" or so rounded edges.
Most cars A-pillars should be rounded enough to prevent any vortex-formation.
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"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.
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