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Old 03-01-2012, 10:36 PM   #16 (permalink)
KamperBob
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If the bed is long enough that air could reattach to a full tonneau what I suspect happens is the separation bubbles (mirror pair with center forward flow to balance boundary conditions) are smaller and rounder. As a result less energy to stir them. Hence less drag. (I wish I had better words to explain that, sorry.)
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