Diesel info for those who asked, to the best of my knowledge. The diesel used in the Liberty's were Italian made. They have been discontinued for now, in this country. All over-the-road diesel fuel sold now is Ultra Low Sulfur, which can be used in any diesel engine, but is mandatory for 2007 and newer engines, that have much different emission equipment. Kinda like the old days when unleaded was introduced, you could use unleaded in any engine ( yea, it was hard on "regular" valve seats), but you couldn't use leaded fuel in the new "unleaded" vehicles. If you have a pre-2007 diesel, it is probably a good idea to use an additive when you use the new fuel, "stanadyne" is often recommended, but there are other brands. If you buy it in bulk, then transfer it to a small, easy to carry bottle in your vehicle, it doesn't add much to the cost of a fill up. The fuel additives increase the sulfur, for lubrication, and increase the "cetane" level, kinda like octane in gas engines. It also prevents gelling at low temps.
I'm pretty new to the diesel scene, bought a new 2005 Dodge a few years ago, and one of my sons just recently bought an '04 Dodge, also diesel.
Also, for those thinking about a wrangler, but are concerned about heating/cooling in extreme weather, how about adding some removable insulation to floor, and maybe to the interior of the hardtop??
Mark