Tailgate up, at least from the videos.
With the tailgate up you're leaving a shorter wake -- the gate catches some of the turbulence from the cab and puts its momentum back into the vehicle.
ETA: "Shorter" as in vertical height. The trailing length isn't as important, it's the perpendicular area of the dead wake that "pulls back" on the vehicle.
Last edited by garys_1k; 07-18-2008 at 03:09 PM..
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