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Old 01-27-2014, 02:07 PM   #1
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JKU more thirsty in Winter?

Hi Jeep Fan, got a question for you: I have a 2012 JKU with the Pentastar and it seems to be way more thirsty in the deep cold. I'm doing 370km with a full tank when I was doing 450 in the summer. Is this normal?

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Old 01-27-2014, 02:10 PM   #2
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yes

air is thicker when it's cold = more drag
winter blend gas = less efficient

also add in longer warm up times.

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Old 01-27-2014, 02:15 PM   #3
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Quote:
Originally Posted by Bluegray38 View Post
Hi Jeep Fan, got a question for you: I have a 2012 JKU with the Pentastar and it seems to be way more thirsty in the deep cold. I'm doing 370km with a full tank when I was doing 450 in the summer. Is this normal?
The colder air will be more dense with O2. The computer on the Jeep will compensate by adding more fuel so you may see a drop in MPG (KPG) due to this compensation. The other reason you may see different fuel efficiency in the winter is due to different fuel blends. Cheaper Chemicals can be blended into gasoline in the winter which can be burned less efficiently, leading toward lower KPG. It may be a combination of those two things that are causing your efficiency to drop in the winter months and this deep cold. Let me know if you have any other questions!

-Ryan
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Old 01-27-2014, 02:40 PM   #4
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This and frozen drive train. I always get a drop of around 20% each winter with al my vehicule, JK included.
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Old 01-27-2014, 03:03 PM   #5
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This and frozen drive train. I always get a drop of around 20% each winter with al my vehicule, JK included.
I changed my front diff cover last night. The oil is MUCH more viscous in winter vs when I changed the rear in summer! I'm sure that's a factor.
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Old 01-27-2014, 03:37 PM   #6
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Seat covers are tighter in the winter, and we all know that certain parts perform poorly with tight fitting clothing.
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Old 01-27-2014, 09:26 PM   #7
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Quote:
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This and frozen drive train. I always get a drop of around 20% each winter with al my vehicule, JK included.
This sounds right. I was getting 22.5 MPG highway this past summer and after this past week in this cold I am averaging 18.1 MPG. I've noticed similar drops in other vehicles I've had in the past also.
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Old 01-27-2014, 09:38 PM   #8
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I agree, it definitely applies to other vehicles as well. Our other vehicle is a Honda. It's sips at least 20% more in the winter. (as opposed to the jeep which gulps).
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Old 01-27-2014, 09:58 PM   #9
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On the plus side, the cold air will make the throttle a little more responsive

Stomp on that accelerator!
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Old 01-27-2014, 10:08 PM   #10
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Quote:
Originally Posted by Blastek View Post
yes

winter blend gas = less efficient

also add in longer warm up times.
This! Winter blend gas is horrible.
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Old 01-27-2014, 10:25 PM   #11
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If you can avoid Ethanol gas do it. To find a station in your area check out
Ethanol-free gas stations in the U.S. and Canada
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Old 01-27-2014, 11:39 PM   #12
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Definitely. Especially if you're dealing with a lot of snow and using 4wd more often.
I average about 22 in the summer, and I'm averaging around 17 now...
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Old 01-28-2014, 01:43 AM   #13
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If you go to the same gas station and pay attention you can tell exactly when they switch on and off the winter blend. I hope it's saving some trees.
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Old 01-28-2014, 03:45 AM   #14
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For the most part, engine runs richer than summer due to denser air. also the lubricant in your vehicle moving parts are not performing well under low tempratures and your average speed drops on slippery roads. idling also takes it's toll.
this particular engine 3.6L seems to consume about 20-27L/100km depending on temprature and road condition with stock tires. making all types of funny noices in cold start and i worry if the parts are sturdy enough to last me 5 years of ownership...
the best ever engine i had was inline6 from toyota both diesel and gas works flawless...
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Old 01-28-2014, 06:15 PM   #15
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I'm averaging 15 - 16mpg in my 2013 JKU. During the summer I was getting 18 - 19mpg.
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Old 01-28-2014, 06:55 PM   #16
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Yup, this single digit weather in NJ really does hurt the MPG. Sucks having to drive 70 miles a day.
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Old 01-28-2014, 07:06 PM   #17
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it is worse, I got below 15mpg last two weeks with warmups and traffic all directions.

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