Salient line from the PDF:
Quote:
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Relieving the pressure into base of the car through a duct showed an improvement of 2.4% of drag in CFD (2.3% in the wind tunnel)
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I would still be wary of assuming that you can automatically apply the results from a single vehicle to another, particularly different vehicle types (a sedan with fastback roof -- the one in the test the PDF describes -- to a SUV).