Really low mpg?? - JeepForum.com

 
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post #1 of 11 Old 06-23-2013, 09:22 PM Thread Starter
witchdoctor7710
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Really low mpg??

Hi..I have been contemplating lifting my cherokee, but also selling it for a better one/already lifted one. It is stock (01) with 136k on it, and i get 12.5 city, and 20 highway....i don't understand why my city mpg is so low..which is what deterred me from lifting it..because the mpg would be even worse, when i know thats what i should be getting after a lift kit...everything is mechanically sound and up to date...the only thing i could think of is that is needs a very small alignment, but not to where no one can drive it without fighting steering, and i think it needs a hub bearing in the front, from a whirring sound that correlates to the jeep's speed.....my mpg wouldn't be from those to things would it? I find that hard to believe.........also because i was looking at a cherokee that was lifted a while ago that did not have the speedo/odo gear corrected, so the speed and mileage was obvioulsy sightly off....but the truck also had a mpg calculator in it and read 10.8mpg.....so would i assume that would be lower than the actual mpg as well since its going off the same readings the speedo and odo are?


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post #2 of 11 Old 06-23-2013, 09:23 PM Thread Starter
witchdoctor7710
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any help is appreciated, thanks!

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post #3 of 11 Old 06-24-2013, 12:29 AM
CoyoteHunter
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Are you running big or wide tires?
Are your gears stock?
Heavier steel or lighter alloy rims?
Hauling anything?
I'm just throwing out some ideas.
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post #4 of 11 Old 06-24-2013, 12:54 AM
mayeni
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I do not think it is that bad. When I saw the header I was expecting something like 1 mpg. But search the forum, it have been cover at least 10 times the last year.
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post #5 of 11 Old 06-24-2013, 04:58 AM
CJ7-Tim
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Fix any known problems. Make sure all your tune-up/ignition parts are fresh.

Larger tires make the speedometer and odometer display less than actual, so mpg's must be adjusted if you do not install a different speedometer gear.

Your mpg's are not that far off, but I would test the O2 sensors and the Coolant Temperature Sensor, and replace them if they are slow to respond or failing. Your driving style has the greatest effect on your mpg's.

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post #6 of 11 Old 06-24-2013, 06:20 AM
TheBoogieman
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I get 12-13 mpg city with a 4.5" lift and larger tires.I could get a little better but I drive with a heavy right foot.Driving style has a lot to do with mileage.

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Originally Posted by mrblaine View Post
It works until it doesn't.
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post #7 of 11 Old 06-24-2013, 07:36 AM
Supertrooper50
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I run 4.56 on 33s and I get 16 town 22 hwy
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post #8 of 11 Old 06-24-2013, 07:50 AM
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Quote:
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I run 4.56 on 33s and I get 16 town 22 hwy
Show-off!

Quote:
Originally Posted by mrblaine View Post
It works until it doesn't.
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post #9 of 11 Old 06-24-2013, 10:21 AM Thread Starter
witchdoctor7710
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everyting is up to date, and every thing is stock, I have no lift, and i have 235/75/15 tires, gears are stock, I have some stuff in the back and a brush guard, but nothing that wold be like hauling something...my driving is fine, i dont really drive with a heavy foot so it isnt that, and @cj7-tim, yes you would have to do that, but im saying would the mpg displayed in the overhead be off like the speedo since they're both computer based in the truck?

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post #10 of 11 Old 06-24-2013, 01:16 PM
bobthecatkiller
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Quote:
Originally Posted by witchdoctor7710
everyting is up to date, and every thing is stock, I have no lift, and i have 235/75/15 tires, gears are stock, I have some stuff in the back and a brush guard, but nothing that wold be like hauling something...my driving is fine, i dont really drive with a heavy foot so it isnt that, and @cj7-tim, yes you would have to do that, but im saying would the mpg displayed in the overhead be off like the speedo since they're both computer based in the truck?
Just a FYI my overhead shows 15mpg, and my ultra gauge shows 12-13mpg calculated myself comes out to be 12-13. Stock up country with 235s, gets up to and stays at 185-215f, New o2 sensors, new intake filter, fresh plugs, grounds all redone, I always stay under 2k rpm, 784 injectors, injector cleaner every fill up, intakes manifold is clean as a whistle along with the tb, everything sounds mechanically sound.
Iv come to the conclusion that I just take very short trips, all the time and that's what causing the bad mpg. Work is 4 miles always and everything else is pretty much less then a mile away. like you I also get 20-21mpg hwy

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post #11 of 11 Old 06-24-2013, 05:41 PM Thread Starter
witchdoctor7710
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So do you think that cold be why as well? becuase everything is pretty much a few miles away from me

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