Tom,
No science, but scientific intuition---needing massive federal funding to turn it into science.

The Winnie pushes the air out of the way. The amount of energy required to do this is directly related to the Winnie's speed, and shape ( and prevailing wind speed and direction). I see no way that a vehicle in the draft space behind the Winnie has any effect on the Winne--unless he extends a tow bar that latches onto the rear bumper of the Winnie......

Perhaps the Winnie driver believes all in life is a zero-sum game, so if the drafting vehicle benefits, then it must necessarily be costing the Winnie.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags