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Neil,
Maybe you missed the part of the boxfish story where they said that by simply lowering the model from its original test position that would be in free flow conditions, down to proximity to the ground, as is the rule for cars, the drag coefficient would go up some 40% to 45% or so. That had nothing to do with wheels; it was simply that the road disturbed the flow of air around the body that existed in free flow conditions, cutting off much of the flow underneath.
Then we find that earlier, Morelli showed a similar effect for a simple shape, which was a tear drop with some flattening on the bottom. Again, that is in that 1982 paper.
"Can't be physically done" is not a judgment that should be accepted without real trying.
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