UPDATE: 07/23/13
2013-05-16
GMC Pickups 101: Busting Myths of Truck Aerodynamics
2014 Sierra gains fuel economy, quietness from time in wind tunnel
GMC Pickups 101: Busting Myths of Truck Aerodynamics
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So what accessories can truck owners add to help aerodynamics? Tonneau covers for the bed help smooth airflow over the truck, and Bloch says soft covers are more beneficial than hard covers because they form to how the air wants to flow. Running boards can also help air flow smoothly down the truck’s sides.
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I say that there are support ribs which disrupt this flow and theory, plus the flutter of the fabric adds air flow distortion. However, I'm not an aerodynamics, so what do I know? I only know what I have seen on my own truck covers.
Some tailgate up verse down discussion the article too.
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Even the top of the Sierra’s tailgate and the center high-mounted stop light are optimized to guide air cleanly around the truck. And because Bloch’s team detected unwanted airflow between the cab and bed, new sealing has been added.
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Mind the gap.