Considering the frontal area, the drag reduction is, on the scale of the car, very small. How much of the frontal area of a car is tyre? I cannot see comparisons of deflector shapes being able to be measured on the road, far too many variables.
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you'd think people here would think twice before linking to incorrect material (or at least flag the errors).
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Not just that, being clear with what is actually being quoted is important too, so people aren't misled.