The Jeep is heavy, has a 4 speed auto tranny and is as aerodynamic as a 5 story house so if you want tolerable mileage out of it you have no choice but to drive more slowly. When I drove mine "normally," which is idling at red lights, driving the speed limit, accelerating typically etc I got 15.5. If I baby it, I get 17.5 on winter blend and 19 on summer blend. I shut off the Jeep at red lights and coast in neutral as often as possible. Unfortunately gas prices are only going up. I wish I had a stick so I could hyper mile it and get 25mpg's.

The Jeep is thirsty as hell. Ease up on the pedal and you'll squeeze at least another 100 miles out of the tank easily. At 12 or 13 mpg's you must be driving it way too hard. Also, the computer learns your driving habits and adjusts accordingly so I presume that since you have a lead foot a lot of the time it's learned to give it more gas than you intend to and you're burning through fuel. Disconnect the battery and start driving more slowly and the computer will help you drive more efficiently. Sounds crazy but it's actually true.

 

QFT. My Jeep and my wifes van dropped big time back a couple of months ago, the first few tanks, 22% for me. It has gotten marginally better, but not back up to summer blend mileage.

 

I've noticed a 1.5mpg drop with the winter blend.

 

" The Jeep is thirsty as hell. Ease up on the pedal and you'll squeeze at least another 100 miles out of the tank easily. At 12 or 13 mpg's you must be driving it way too hard. Also, the computer learns your driving habits and adjusts accordingly so I presume that since you have a lead foot a lot of the time it's learned to give it more gas than you intend to and you're burning through fuel. Disconnect the battery and start driving more slowly and the computer will help you drive more efficiently. Sounds crazy but it's actually true "

I have been a little heavier on he pedal but only because I am trying to get my TC -tranny shudder to stop ..But I still dont go above 3000 rpm's while lead footing it

 

I just bought a new 2008 Rubicon (Auto trans.) I drive "responsibly" (like a grandma) most of the time. I just turned 1,200 miles and get around 13.4 on the average.

 

New, my 2 door 6-sp Rubicon with lift, bumpers, 35" Toyos, winch (installed at 50 miles) and stock 4.10 gears, gave me 11.2mpg.
Now, at 6k it's usually more like 16 or even a little better with the winterized fuel. Mostly city/suburban driving mix is around 15.5mpg.

Roughly 1000 miles this weekend up to Tango's place in Kentucky, mostly interstate at 75-79 mph, gave a verified trip average of 16.6mpg.

 

mine has been real consistent in its 20,000 miles of Life.. I get 16-18 in town... 22-24 on highway running 65 MPH and not a big headwind... run it up to 70 or 75 or introduce a headwind and that average goes in the toilet... ive run the Jeep ohio to florida and back twice and miami to charlotte and back twice and those averages were pretty consistent for me...
all stock X with 17" wheels , 6 speed 3.21 gears
-Christopher

 

14.45 mpg auto trans/5:13's/37's. And that's with me warming up the JK several times a week. My max speed is 70 typically 60-65 in traffic.