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Old 12-01-2013, 02:35 PM   #1
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Poor gas mileage

I know generally low mpg is part of the "jeep life" but constantly getting about 12-13 mpg while driving on long roads(little stop and go about 20 miles a day) on a 2.5 bb and the standard 32" bfg km with about 4/32 left on them is not good.

About a month or so ago i used a can of seafoam in the gas and for that tank of gas it was way better giving about 15-16 mpg .. But ever since then back to low mpg's .. Last full tank lasted about 273 miles .. Thats a 21 gallon tank and should go longer than that.. I dont constantly rev it up nor am i heavy on the pedal as i am conscious about my gas and definitely trying to save it.. Thoughts anyone!

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Old 12-01-2013, 02:44 PM   #2
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There are plenty others with more Jeep experience than me on here but that sounds like crappy mileage. I have a stop 2013 2-door and can get around 20 if I"m cruise controlling at 60 - 65 on the highway. What year and mileage?

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Old 12-01-2013, 03:08 PM   #3
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I shouldve mentioned 08 jkur 73 k
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Old 12-01-2013, 04:28 PM   #4
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have you changed the plugs? do you have an aggressive driving style? heat on full blast? The last time any of my jeeps got that bad of mileage, a week later i threw a rod
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Old 12-01-2013, 04:39 PM   #5
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I dont drive aggressive as i mentioned im conscious about saving gas.. I have been using the heat on high but dont think that it could single handedly be the cause ? Or could it?!?
I havent changed the plugs. I have had the jeep for almost 4 months and this is as bad as its been even while towing a 1000 pound trailer loaded with a jetski (roughly additional 400 pound) i never had this bad mileage
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Old 12-01-2013, 04:53 PM   #6
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I've a 2010 Unlimited Islander, which has the same engine and tires as your JKUR and I get a reliable 21 with 80/20 highway/city. My worst tank was 17, towing in hilly NH.
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Old 12-01-2013, 04:54 PM   #7
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Funny my buddy has a 2013 unlimited and only has about 1500 miles and he too only gets about 12-13 miles to the gallon, which sucks. But i told him to wait until the jeep has about 3 thousand miles and then see what happens. Should he be concerned? Even when he has driven on the highway for 60 miles at 60 miles an hour this is what he gets. What gives?
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Old 12-01-2013, 04:58 PM   #8
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I am getting 16 mix highway and city, not happy as well. Summer time it is better (17/18), check your tires pressure and change gas-station to different brand. I found Costco brand 87 is usually worse on mpg than BP or Shell, but not much. All this could adjust a little your mpg, but if you are at high millage you might need tune-up including new spark plugs etc first.
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Old 12-01-2013, 04:59 PM   #9
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I've a 2010 Unlimited Islander, which has the same engine and tires as your JKUR and I get a reliable 21 with 80/20 highway/city. My worst tank was 17, towing in hilly NH.
Time since last tune up? Have you lifted it at all?
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Old 12-01-2013, 05:01 PM   #10
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Stock, 33K miles, nothing but oil and diff changes.

S
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Old 12-01-2013, 05:25 PM   #11
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I have a 2013 Unlimited & get 18-19 mixed & 23-24 hwy
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Old 12-01-2013, 05:32 PM   #12
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Thanks for sharing your performance.. Any iseas on how i can get similar performance
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Old 12-01-2013, 05:34 PM   #13
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I have a 2013. 8000 miles. 15-16 mpg city. 18-19 on interstate at 70 mph. Up to 23-24 on highway at 55 mph. This is with hills in Southern Indiana.
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Old 12-01-2013, 07:56 PM   #14
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I am getting 16 mix highway and city, not happy as well. Summer time it is better (17/18), check your tires pressure and change gas-station to different brand. I found Costco brand 87 is usually worse on mpg than BP or Shell, but not much. All this could adjust a little your mpg, but if you are at high millage you might need tune-up including new spark plugs etc first.
This is a great point, I filled my 2012 up with Costco gas and I got 1.5-2 mpg less than I normally get when compared to Sunoco. I would say try another brand gas first and see if that helps.
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Old 12-02-2013, 11:01 AM   #15
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Originally Posted by eldomi809 View Post
I know generally low mpg is part of the "jeep life" but constantly getting about 12-13 mpg while driving on long roads(little stop and go about 20 miles a day) on a 2.5 bb and the standard 32" bfg km with about 4/32 left on them is not good.

About a month or so ago i used a can of seafoam in the gas and for that tank of gas it was way better giving about 15-16 mpg .. But ever since then back to low mpg's .. Last full tank lasted about 273 miles .. Thats a 21 gallon tank and should go longer than that.. I dont constantly rev it up nor am i heavy on the pedal as i am conscious about my gas and definitely trying to save it.. Thoughts anyone!
That is what I get with a heavily modified JKUR. Gearing and such makes a difference when comparing with others but it sounds like yours is fairly stock except for the 33's. You should expect at least 15-16 all the time. If the seafoam changed it then it went back you probably have an issue. I would start with some basic maintenance like tune-up and such. Filled mine up yesterday and got 11.74. Hmmm, must have had a heavy foot a couple times on that tank.
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Old 12-02-2013, 12:52 PM   #16
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Mine is 13 JKU with 35" and 2.5" lift. I get 13-14 MPG in the city, and 15-16 MPG Highway. Still sucks, at least i'm in love with my jeep, i can forgive her for giving me such attitude
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Old 12-02-2013, 01:48 PM   #17
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comparing 08 to 13 is not good comparison, different drivetrain.

I have 08 with 98k miles, still getting 16-17 combined that I've always gotten since I purchased it with 54k miles.

I've never noticed a difference in fuel economy on any of my current or past vehicles based on gas from different stations. Gasoline is gasoline is gasoline for the most part.. the difference is additives.

How long since you've done an oil change? what kind of oil do you use? do you hear a ticking sound from the engine? I've seen similar bad fuel economy come from sticky lifters.
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Old 12-02-2013, 01:58 PM   #18
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Last oil change was done about 500 miles ago and i used the seafoam right after it. Now that its alot colder out on a cold start (usually the first of the day) i will hear loud ticking almost as like knock but not bad . (No vibrations.. No misfiring ) .. This does not occur again on any subsequent starts even after the jeep has sat for hours and back down to C .. Its also not consistent.. I put 5w-30 (as the dealer i bought it from is not a jeep dealer and as long as i do some routing maintenance every 3-6-9-15 k miles they give a free power train warranty) i figured as a safety blanket ill do whatever minimum maintenance they require for that warranty service..manufacturer calls for 5w-20 and 5w-30 cant be bas as ive read many others using it.
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Old 12-02-2013, 02:12 PM   #19
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Tire pressure, air filter, different gas mixture "Ethanol" These will affect mileage!
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Old 12-02-2013, 02:27 PM   #20
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If you changed the tires and did not adjust your computer than things will be off slightly. The speedo and odometer will be off. Factor in the percentage of tire change and that should help but my 2012 JKUMW3 gets 16.5 at highway speeds averaging 75-90mph.

Yes I drive it like I stole it!! We all should as we will never know when that mini van will total our jeeps (damn soccer moms). HAHA!! I know speed kills but the truth is someone else will wreck our jeeps before we do.
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Old 12-02-2013, 02:31 PM   #21
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E10 is good for a 10% drop in mileage potential, right off of the bat. The brick-like aerodynamic properties of the JKU do not help. Adding lift to that brick just makes a taller, even less efficient brick.
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Old 12-02-2013, 03:35 PM   #22
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That's with a 6-speed and combined city/highway, more city (Rather, small town) than highway.

Over the holiday where I drove 300 miles on the highway I was getting 25.7mpg.

I don't consider that shabby in the least.
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Old 12-02-2013, 04:15 PM   #23
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My 2014 JK 2 door manual, 3.73, 32" bfg's normally shows 16-17mpg mostly in town driving.
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Old 12-02-2013, 04:28 PM   #24
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How much city vs highway driving? I probably get around 10mpg in the city. I get about 250 to 300 miles out of a 17 gal tank with a winch, lightbar, 33x12.5s, stubby bumper.....

But city driving is going to kill mpg on any vehicle. Especially jeeps and suvs. These jeeps weigh around 4500lb and have the front driveline causing a slight extra drag (even in 2 wheel drive). That weight will hurt fuel usage when accelerating from a stop light more than it will holding a steady speed on the highway. If you have an automatic, the torque converter slips a bit at lower speeds (locks in on the highway causing zero slip)

Dont be in a big hurry just to stop. If youre really driving economically, you will use very little brake. Every time you touch the brake pedal you are wasting gas. Then again, dont hit something trying to save gas that way.......
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Old 12-02-2013, 04:30 PM   #25
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That's with a 6-speed and combined city/highway, more city (Rather, small town) than highway.

Over the holiday where I drove 300 miles on the highway I was getting 25.7mpg.

I don't consider that shabby in the least.

Check your fuel receipts vs milage. I highly doubt your evic is reading accurately. I have never in my life seen a dash display show an accurate mpg.
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Old 12-02-2013, 05:27 PM   #26
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Check your fuel receipts vs milage. I highly doubt your evic is reading accurately. I have never in my life seen a dash display show an accurate mpg.
I track mine by fillups with an app on my phone. I figured the evic would be off. Have done some comparisons and it surprised the crap out of me that it was pretty accurate. I think there was like a .2 difference. I have a history with not trusting those things (still don't) but I have to say that technology has certainly improved over the last 15+ years.
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Old 12-02-2013, 05:33 PM   #27
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Check your fuel receipts vs milage. I highly doubt your evic is reading accurately. I have never in my life seen a dash display show an accurate mpg.
I have, and it's very close.

I've driven a Honda CRX with a shift light for damn near 15 years, and I still drive the Jeep like I drive that. I was getting damn near 80mpg in the CRX by doing what that shift light said.
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Old 12-02-2013, 06:10 PM   #28
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I have, and it's very close.

I've driven a Honda CRX with a shift light for damn near 15 years, and I still drive the Jeep like I drive that. I was getting damn near 80mpg in the CRX by doing what that shift light said.
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I track mine by fillups with an app on my phone. I figured the evic would be off. Have done some comparisons and it surprised the crap out of me that it was pretty accurate. I think there was like a .2 difference. I have a history with not trusting those things (still don't) but I have to say that technology has certainly improved over the last 15+ years.
Thats crazy. Of course i dont have the fancy evic stuff. Just the right side display with temp, odometer....
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Old 12-02-2013, 07:01 PM   #29
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This is a great point, I filled my 2012 up with Costco gas and I got 1.5-2 mpg less than I normally get when compared to Sunoco. I would say try another brand gas first and see if that helps.
It is, so whatever we are saving there on price is going away with poor mpg. I am changed to BP for last couple of tanks and it is noticeable but still not very large difference.
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Old 12-02-2013, 07:14 PM   #30
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I installed a mopar cruise control and it improved my fuel economy on the highway

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