[scivicblu83]

tail gate up definitely, mythbusters have done tests and dodge's production trucks support this. these are quotes from Dodge;

"Despite a bolder and more aggressive front end, the Ram 1500 boasts best-in-class aerodynamics and, with active aerodynamics, a 6% aerodynamic improvement on the new truck (cD is now 0.363, vs 0.386 in the 2012, for regular cab / 4x2). The front air dam was extended downward to create a 0.6% improvement in fuel economy, while a new thermo-plastic material is more malleable, preventing breakage."

"Select 2013 Ram 1500s have a standard, segment-exclusive locking tri-fold tonneau cover. It both protects bed storage and increases fuel economy by 0.8%. Owners can use one, two, or all sections of the cover by folding the system on top of itself."

Dave Sowers said that riding with the tailgate down increases drag, while a tonneau cover makes the truck much more aerodynamic.


with the gate up you get a barrel of air that spins in the bed and behind the gate that transition the air from the roof to the tail. kinda like this.