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I'm going to say that the average hubcap doesn't allow too much air to pass across it's surface (to get behind it), and it sticks out enough that if it were smooth, it would look like a mooneye cap, so it probably helps.
Of course, that's my opinion. Can't prove it.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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