instead of removing air dams
and opening up more space in the grille
here's what was done
to the 2009 Ram:

http://www.turbodieselregister.com/2...rodynamics.pdf

here's GM's ideas on how to tweak a pickup to win a MPG contest:

http://www.popsci.com/cars/article/2...rinks-less-car

and

http://www.signonsandiego.com/uniont..._lz1d10gm.html

if you do a MPG test
and want to know if perhaps a head/tail/side wind
influenced the result
you can check any date/yr for the nearest airport weather station at

http://tribunewx.wunderground.com/US...WindSpeed.html