Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Partial Tonneau cover on pickup (plus cab extension

Kevin Cooper · 09-02-2008, 05:56 PM

A partial tonneau cover, having about 60% of the length of the box, attached at the tailgate and running forward gives the largest drag reduction. Even greater than a full tonneau. This was shown some years ago by GM and was the subject of a patent. Since then, I showed the same behaviour in a full-scale wind tunnel test reported in SAE 2004-01-1146 entitled "Pickup Truck Aerodynamics – Keep Your Tailgate Up".

09-02-2008, 05:56 PM	#15 (permalink)
Kevin Cooper EcoModding Lurker Join Date: Aug 2008 Location: Ottawa, Canada Posts: 10 Thanks: 0 Thanked 3 Times in 2 Posts	Partial tonneau A partial tonneau cover, having about 60% of the length of the box, attached at the tailgate and running forward gives the largest drag reduction. Even greater than a full tonneau. This was shown some years ago by GM and was the subject of a patent. Since then, I showed the same behaviour in a full-scale wind tunnel test reported in SAE 2004-01-1146 entitled "Pickup Truck Aerodynamics – Keep Your Tailgate Up".