Just doing a quick search from Yahoo for "truck aerodynamics tailgate" I picked up a whole lot of responses. Ignoring the ones that were for companies advertising their products, there were a lot of articles that support leaving the tailgate up for better aerodynamics and safety.
One report did mention that adding a tonneau cover MAY help even more, and another noted that the net-gates actually could make it worse than just the open gate.
If it works for you, go for it. There's always variables that can change things.
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Genthar
Rhino Lining, Waag one piece grille guard and wheel to wheel nerf bars, 3M Xpel on headlights, front corner lights, and foglights, Valentine One radar detector, XM Satellite radio, Navigon 7100 GPS, Lightforce 240 Blitz aux lights, Aux. reverse lights.
AEM Brute force intake, courtesy of AEM Power and TundraSolutions.com
Teamwest Coilovers, Camburg Upper A arms, Daystar Steering Rack Bushings, Total Chaos Diff Drop spacer, JBA Headers, Y-Pipe, and EVOL exhaust.
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