Cancan - 24 ltr/100 km.
Is your Jeep petrol or Diesel?
As matty mentioned Petrol Hemi V8.
It averages 10.8l/100km when not towing on open roads. I will towing the van back to Brisbane next month but I will be on a tight time frame so will be pushing it a bit again but when I bring it back to Roma I will be taking my time so will be good to see the difference in fuel economy.
I still havent put anything down on the floor (restricted with flying in) and it has been -3 to -4 this week, slippers make a wonderful difference but I have a list of mods to do whilst it is in Brisbane (if I get time)