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Terrible mpg in my gc 2011

Old 10-25-2016, 06:36 PM
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Default Terrible mpg in my gc 2011

Hello guys like the tittle say I'm having terrible mpg in my gc 2011 I'm getting 9mpg in city I don't drive much in highway I used to get 11 -12 mpg now I'm barely getting 9 mpg what could be wrong.
It's a 2wd v6 jeep grand Cherokee 2011 with 50k miles

Thanks in advance to any help .
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Old 10-25-2016, 06:39 PM
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Welcome to Cherokee Forum Skull,
as far mileage have no clue, but a 5000lb car being pushed around by an anemic 3.6L engine won't get good mileage no matter what you do
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Old 10-25-2016, 07:43 PM
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Originally Posted by Willys55 View Post
Welcome to Cherokee Forum Skull,
as far mileage have no clue, but a 5000lb car being pushed around by an anemic 3.6L engine won't get good mileage no matter what you do
My dad has a 2013 or 2014 "4x4" and gets 30 mpg highway, this guy probably has a problem.

Last edited by kyle96xj; 10-25-2016 at 07:46 PM.
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Old 10-25-2016, 08:48 PM
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Driving habits?Maybe it needs a tune up or has the engine light on ?
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Old 10-25-2016, 10:50 PM
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Yeah, my 2008 3.7 4x4 gets 13.4 and I think thats bad. Just around town driving for me. Does it seem like its running ok?
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Old 10-26-2016, 12:03 AM
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No engine lights on and it runs fine as far as I can tell .
I know it's a v6 I'm wondering what mpg u guys get because 9mpg is ridiculous.

I only drive around town. Should I take it to the shop or is normal mpg for this car
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Old 10-26-2016, 01:35 AM
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Depending on your locale, are you spending lots of time warming it up? That will cut significantly into your fuel mileage. Just ask me.
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Old 10-26-2016, 04:20 AM
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9mpg does sound excessive.
Take it for a diagnostic check & find out if there are any fault codes.
My 2000 WJ 4.0 does around 13.8mpg on mainly short runs but I've had 23mpg on a long run.
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Old 10-26-2016, 07:23 AM
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My 2008 GC limited with the 5.7 hemi gets shot 10/11 mpg as of now and I used to get a few more mpg. I have noticed recently that it's lower than usual. Would oxygen sensors being bad have anything to do with this? I have also noticed my tail pipe is blacker and it shows signs that I'm burning more fuel than usual?
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Old 10-27-2016, 05:48 AM
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It may just need some new spark plugs. Constant in town driving with no open road running will foul the plugs pretty quick. Take it for an interstate run at 75 mph for fifty or more miles and see if it improves your mileage, that will clean the plugs up somewhat and also blow out the cat converter some. edit to add. I would put some name brand injector cleaner or stp or lucas oil fuel treatment in the gas tank before running it down the interstate to help clean the carbon our of the cylinder heads etc. a lot better. I would also count the shifts on the tranny to make sure it is going into high gear and overdrive when at operating speed.

Last edited by Cleman Simpson; 10-27-2016 at 06:02 AM.
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Old 10-27-2016, 06:53 PM
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Originally Posted by Bloomy016 View Post
My 2008 GC limited with the 5.7 hemi gets shot 10/11 mpg as of now and I used to get a few more mpg. I have noticed recently that it's lower than usual. Would oxygen sensors being bad have anything to do with this? I have also noticed my tail pipe is blacker and it shows signs that I'm burning more fuel than usual?
yes. The O2 Sensor will definitely cause poor fuel mileage. Its in part how the ECU decides how much fuel to inject.
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