plus your foot matters a lot. my first MJ was only 10 years old at the time I got it and I regularly got ~12 mpg for, um, reasons. but a long freeway drive would give me around 20 so I didn't much worry about it.
that makes sense
this more or less is the breakdown. did you have any specific questions? It isn't complete though. every truck had a ton more codes associated with it. but the info was lost in (rumor has it) a basement flood before they were all uploaded to chysler's computers. if you look at a 91 or 92, you'll see what I mean. early years just have fewer surviving codes in the database.