[aerohead]

I walked past a Liberty on the way over here.We've had some rain and the owner hadn't washed the Jeep yet.
From the dried rain water tracings left on the Liberty it would indicate mighty fine, energetic ,and fully-attached flow over the windshield header and around the A-pillars.
* On close inspection of the car I would remark that an add-on nose would allow you to seal the entire grille leaving only a shark-mouth slit at the bottom.
* A deeper,wrap-around airdam would prevent air colliding with the suspension members.
* minimizing the front wheel opening gaps would help.
* dropping the rocker panels down another 5-inches ( 125mm ) would be good.
* blending the rocker panels into full rear wheel skirts would guarantee better lower onset flow to the back.
* flush wheel covers.
* bellypan later with diffuser.
* slip-on tail of any length.( the Liberty has only a 2.425 L/H ratio and without additional length it's going to be a rough go getting the drag down appreciably.Hucho suggests L/H = 5.0 as a goal for low drag which equals L/D=2.5 in ground-reflection.The 'Template' is modeled on this protocol.
You're at Cd 0.421 right now,about same as Grand Cherokee.Wrangler is Cd 0.55,down from Cd 0.8 in 1971.