I would agree that if you are looking for great fuel economy, none of the GC's should be in your pool of potential vehicles. That being said, I do not know why so many think the HEMI V8 doesn't get an acceptable amount of miles per gallon. I travel approximately 120 miles per day four days a week to attend my graduate program. I have been averaging 21 mpg in good weather, and about 19 mpg in windy weather, and when in a bit of a hurry
. The MDS actually does help on longer stretches. In town and on shorter trips, I can go as low as 15 mpg, but mainly, I drive on the highway, so those trips are very rare.
I happen to be trying to sell my GC Limited, so if you are in the Missouri area, you are welcome to come by and take a look.
Hope this helps you and good luck finding the right vehicle!