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It's the oscillation of the flow into and out from the wake that makes the difference. The key to smooth flow is none other than smooth flow. Oscillation requires extra energy which is extracted from the inertia of the vehicle.
That oscillation also can cause stability issues on some shapes. I think the rear end of the truck is heavy enough to not really be bothered by it.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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