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The main point of my post was that neither truck had had any treatment. In OE form, the "conventional" truck has more skin friction and shape associated drag, because the flow has to change direction so many more times.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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