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  #13  
Old 09-01-2011, 01:02 PM
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Re: Need better fuel economy

TJKJWJ.. i have checked my tires and i replaced my air filter. No lights are on and the over head says 10.8 average mileage. But i have also tracked my last fill up and marked when i filled up and did my own calculation to see how many miles i'm getting in between fill ups and it averaged about 11 miles a gallon. I can also just tell that with the amount of driving i do it cant be right
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  #14  
Old 09-01-2011, 01:13 PM
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Re: Need better fuel economy

mine has been reading 13mpg for awhile, but in the winter i couldnt get over 11.
although i let it warm up for 10 miuntes with the heat on by remote start so its toasty when i get in lol
the mileage sucks but its a Jeep lol
my uncles 2002 f250 crew cab v8 gasser thats lifted with big mud tires only gets 8-10 on the highway so it could be worse lol no clue what he gets in the city, 6 or 7 mpg? lol
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  #15  
Old 09-01-2011, 01:30 PM
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Re: Need better fuel economy

Well if it runs like a top and everything is fine, I'd start suspecting lazy 02 sensors. I'm pretty sure you only have 2 so it wouldn't be THAT expensive. Get them at the dealer though...no Autozone or Bosch units or you'll end up with more issues than you started with. I hate to see people throw money at a problem without knowing what it is, but if I were you, that would be my next step.
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Old 09-01-2011, 01:33 PM
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Re: Need better fuel economy

thanks so much for the help!
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  #17  
Old 09-01-2011, 09:17 PM
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Re: Need better fuel economy

Also when the fuel pressure is too low, you will get a higher fuel consumption. Had this same issue last year on mine. Change the fuel filter/pressure regulator when not done lately, a cheap fix.
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  #18  
Old 09-02-2011, 08:50 AM
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Re: Need better fuel economy

Double what Tony and Frank say

I know they changed the location of the fuel regulator on the 4.0 from the earlier models but if you have a test port on the fuel rail you can probably get a loaner from an auto store. Also they can check the O2 sensors with an OBDII scan tool, if the voltage on the first sensor doesnt change back and forth very much it is probably bad. At least there are only 2 on the 4.0. I believe denso is the OE manufacturer for Jeep on the O2 sensors, which are available at rockauto.com for a better price than a dealer. Don't quote me 100% on that though.
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Old 09-02-2011, 05:43 PM
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Re: Need better fuel economy

Thanks guys i will definatly check my o2 sensors i hope that helps. Will also check fuel filter
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Old 09-03-2011, 09:25 PM
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Re: Need better fuel economy

It is possible to have a bad Catalytic Converter. They do not always make weird sounds.
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  #21  
Old 09-04-2011, 06:59 PM
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Re: Need better fuel economy

you buy a jeep because you love them not for their gas consumption
if your only driving 10 mins in town or idling it for 10 to warm your cold a***e up then wat do ya expect???????????????????
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Old 09-05-2011, 09:32 AM
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Re: Need better fuel economy

My 04 Overland with 4.7 HO only gets about 11 mpg when I only drive it to work, which is about 10 minutes. Hardly gets warmed up, and a cold engine uses more fuel. Just driving it a little bit longer, jumps to 15 or 16, then on highway a couple of weeks ago, got a bit better than 22 mpg.

In the winter, local driving it only gets worse.

Same holds true with my 96 with 5.2. But it is even worse on gas around town. On highway it gets about 18 mpg.

What does yours get when you go further? With only going 10 minutes, it is probably getting up to operating temperature about the time you shut it off. That is if the thermostat is letting it warm up enough.

As someone said, make sure your throttle body is clean, I see a lot of them really dirty, check you thermostat to see if engine is getting hot enough.

But overall, not too sure you will be getting a lot more mpg with 10 minute runs.

Also you mentioned coasting. I assume you mean bumping into nuetrol. Leave it in gear, because the computer will actually cut fuel going down hills, in nuetrol, it still feeds fuel. In mine with magna flow muffler, you can hear going down a hill when the computer cuts the fuel.

Hope this helps, Mark
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