Unless he's got huge mud chunks hanging everywhere, washing and waxing will do absolutely nothing for his mileage at high speeds. The turbulent boundary layer is as thick as your thumb or more, figuratively speaking.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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