I've posted this several times on these forums. It's my chart of MPG for every single tank for the first 20,000 miles on my 2012 JKU with 3.73 rear and manual trans. I can say that I did not see much improvement as the engine "broke in". Anything below 16 was towing a heavy trailer. Anything above 19.5 was purely highway on long trips.

 

i have a 2012 Rubicon Unlimited with stock tires, 2" lift, rock rails and no other mods. I consistently get 16 around town with a little freeway, 18 with a lot of freeway and 20 on long freeway trips. i use cruise on the long trips at about 70-75 mph. love the auto, wouldn't have it any other way.

 

I have not put much effort in to finding the parts I need yet but, if you do the work your self prob around 1500 is a bet

 

are you taking into account winter gas?? Mileage seems to drop with winter gas, must be more ethanol in it or something, mine dropped almost 2 MPG all winter. 13 is really low for consistent mileage, auto or not. I have an '12 auto JKU with 3.73's and get an average of 18 MPG in a 50/50 mix of city and highway driving and am running 33's.

 

Im also getting 13 mpg on my 2012 auto 3.73

 

2013 Unlimited Sahara, 3.21 Rear Axle Ratio, auto, around 12 mpg city and 18 mpg highway.

The higher the axle number the better the mileage?

 

Technically speaking, only f it s mostly highway. The motor works harder to get the vehicle moving with that gearing. It's all about torque. Peak torque at the lowest rpm = best fuel efficiency. That's why diesels are good on mileage. Peak torque hits early.

 

Ok thanks.

I noticed that if I wanted to get the max tow package they would have changed the rear to 3.73?, so that would get better highway mileage, and have more torque when pulling a trailer? As I sit my max pull weight would be 2000, but with the 3.73 it increases to 3500.

 

Winter gas sucks , but I have also seen the ambient air temperature affects the MPG. When its below say 30 degrees I see the MPG be maybe 1 mpg less compared to when it is 50 degrees out. Our jeeps like warmer temperatures, even with winter gas.

 

Max tow package also gets you electronic sway control for towing. There is no way to add that later- can only be done in the factory.