EDIT: HA! You beat me to it by 1 minute, adam728!
---
That RAM has (had?) best in class drag: (cD = 0.363) -- from
http://ecomodder.com/forum/showthrea...ion-24177.html
The Dodge may have more frontal area, but I'm certain the Jeep's drag coefficient is significantly higher.
The 2-door Jeep of that body style is 0.55. The 4-door JK is 0.495 -- from
http://www.jk-forum.com/forums/jk-ta...-105364/page4/
So, aero strikes again. There's that plus all the other things.