My thinking in this is as follows: the increased apparent frontal area is of no consequence, because when the wind leaves the upper line of the vehicle, it detaches, and the space below it may as well also be frontal area.
Really, someone should give it a shot and tuft it.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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