10 mpg right after a tune up does sound a little low. Your AWD is eating up some extra fuel, since the front axle is constantly engaged. Try it with the standard paper air filter and see if the mileage improves.

Also, if most of your miles are over 60 mph, that will reduce fuel consumption because even a grand cherokee isn't very streamliined. If you didn't have AWD, I think that 13 to 14 mpg would be a reasonable expectation.

Don't know how much the AWD is hurting your mileage, since I've never had one.

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.