From my experience as well as a coworkers with 2012's, it does look like the winter causes at least a 1mpg drop. A big part would be the fuel mix, but factors also include warm up time as well as the engine taking a bit longer to get to optimum running temperature.
It always makes me wonder, people add cold air intakes assuming they get more power. Would this then also mean that with a standard configuration your jeep would have more power in the winter compared to summer? I certainly don't feel that in the seat of my pants.

 

I just finished my 4" lift with 35x12.5x16 Dick Cepek Mud Country's. also added OR-Fab rock rails and front stubby with grill bar! Love it! Installing the OR-Fab tire carrier in the next few days.

 

I joined the class of 2012 after the wife totaled my car and purchased on the 4th of july! Mw3 jkur is awesome offroad and the kids love it also. Really need a lift and bigger tires!

 

Sweet!!! I am still saving up the green stamps for a lift and bigger tires...:-(

 

Nice looking rig... welcome to the thread!

 

Putting my 2012 through the mud with my son.

http://youtu.be/rjXWcK_ryBc

 

tell me honestly does that hurt the motor reving to those rpms under water ? ive never gone into water that deep or pushed mine to those rpms ? just wondering if the motors can take that on regular basis ? muffler sound good when you dropped back in in reverse it sounded mad haha

 

Thanks! Ya it took me a bit too and sold another toy but its still a work in progress! Seems to never end!

 

Ooops almost stuck .. wait nope im out


Cool video

 

Yeah for a moment I thought someone was going to have to run the winch line out... LOL