^^Well, then maybe it's because it's sitting there warming up for 5 minutes or longer while I'm brushing off the snow and scraping the windows. In any event, the mpg drops a few in the winter, and definitely drops even more when using 4WD
EDIT: It's more than likely the winter blend of gas they make us use in the northeast.
It's good to know that running the heater has nothing to do with it. Thanks, Katmandu.
Support bacteria. It's the only culture some people have
I have a 2011 rubi auto right now I am getting around 14.1 mpg according to computer in the summer it says around 16.5. I never reprogrammed for by 35s nor have I hand calculated it. I really don't care it needs gas I put gas in it .
Find a station that sells non ethanol fuel in the grade you put in your ride. I found one near where I work and am going to start filling up there. It is 20-30 cents more than the ethanol junk but on my first tank I am going to see at least 2 more mpg if not more. I have an app on my phone called pure gas and it tells you where all non ethanol stations are around you and what grades they sell. It also keeps up with your location as you travel and keep you updated. The results I am seeing are with 89 octane the lowest grade I can run with the RIPP supercharger.
19-20 mpg cold weather, 20-21 mpg warm weather,...w/ 27K miles on my JK, 3.73's, 6 speed, I shift gently, around 2K rpm, coast often, brake little. This is "suburban style" driving, some highway, lots of secondary roads/streets..my dash gauge reads almost always 1 mpg optimistic of manual mpg calculations btw..