2005 KJ about 18-19mpg, 3.7L V6
stock, mostly city and the wife aka 'lead foot' is the driver, 85K miles on it and overdue for me to replace the plugs which might have way too many miles on them, I've read here elsewhere that's a big effect on MPG with the 3.7L V6.
It's a good solid car, not crazy about the ride of course - I drive a vette and it's almost as stiff a ride but around corners, loosy goosy at the same time, and we put new shocks/struts on just last year. Not a single (knock on wood) problem other than the 6-CD changer fried under warranty and the replacement fried soon after warranty expired - I'm ok with that kind of problem!
I am worried it will become a money pit soon at this mileage but, seeing guys here telling their mileage, seems to be a good vehicle.