Ok here is the aerodynamic mess:
A few things I've considered for it: A belly pan or air dam. Looking at the underside, it seems like a full belly pan would be difficult to fabricate and also might cut into ground clearance(Unlike some people, I actually bought a Jeep to take it off road.) Especially since I would have to cover up the axles to make it really effective. Air dam has even more off a problem with ground clearance, unless I could rig to be easily removable for off road driving. I know putting the top on would improve things, but I like it this way in the summer
I've also considered a Kammback for when the top is on, since the rear of the vehicle is extremely flat. Downside-if I understand what I've read here, Kammbacks only help if the airflow is fairly attached at the back. As you can see, the nose is very blunt and the windshield is flat and steep, so the airflow may not attach to the roof. Anyway I could test this before I start rigging up a Kammback? I have used a grill block with modest improvements, however, I don't want to keep it on in the summer because of the heat. Also, I'm a little short on money right now, so I'd like to avoid really expensive projects that may give me little or now mileage improvement.