2014 GMC Sierra's Wind-Tunnel Time Busts Pickup-Truck Fuel Economy Myths

A long-disputed topic among truck owners is whether a tailgate raised or lowered is better for aerodynamics. Diane Bloch, General Motors aerodynamic performance engineer, had the GMC 2014 Sierra full-size pickup truck in General Motors' wind tunnel more than any GMC pickup before it, and learned the truth of it.

A tailgate in the up position is more aerodynamically efficient. As air flows over the truck, it falls over the cab and pushes forward on the rear of the truck. With the tailgate down, the push from that airflow is weaker.

"Replacing the tailgate with an aftermarket net is worse than having no tailgate at all," Bloch said. "Imagine dragging a solid object and a fishing net through water. The net is going to require more muscle."

The Small Faces - a fanbase that's alive and kicking
Inside, stalls will sell Marriott memorabilia and a line up of eight tribute bands will go through the band’s back catalogue. The Small Faces Convention takes place at the O2 Academy, Islington, London on Sunday 20 September from 4pm-10pm.

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.

There are lots of aftermarket accessories available on the pickup market, and Bloch says they have varying impacts on aerodynamics.

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