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OK Now your pulling my legs...both of them.
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The 64,000 Dollar question is will they do that at higher speeds??
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Trollish typing detected.
The answer is tripartite: aero, drive train and the knut behind the wheel. Small bills, please.
Drive train should go to General Efficiency, but you raise a subject for aerodynamics, box vans. I propose transparent pilasters (half columns) over the headlights. They bellmouth the radiator opening and shrink the stagnation area. I went so far as preparing this for an old thread:
The contrast is low, but the other features are repositioned rear-view mirrors and Turnpike Cruiser skirts.
Here is a design for my old panel van that has an airfoil diverter, front skirts and a full boat tail: