Gas mileage on 4.0 I6 - JeepForum.com

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post #1 of 27 Old 04-03-2009, 08:18 AM Thread Starter
mullins1221
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Gas mileage on 4.0 I6

Just out of curiosity, what is everyone averaging on gas mileage? Have not had mine very long and am getting about 17.5mpg (although with a stopped up cat, that will be fixed next wk and I hope that will help a little). Have already changed out air and fuel filters- I think the previous owner had a religious objection to maintenance as it looked like mud was coming out of the fuel filter I took off of it! Any suggestions as to anything else I can check to get the mpg up a little?
Thanks so much for any help you can give me.

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post #2 of 27 Old 04-03-2009, 08:52 AM
jeeptown
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Thats about average in cool weather. 15-19 mpg is what they are rated by the epa at. Get that Cat fixed and that should help bring it up somewhat.
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post #3 of 27 Old 04-03-2009, 09:03 AM
jzonts
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There are a bunch of threads out there on gas mileage a simple search will turn up a bunch. But the main thing is keeping it maintained.

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post #4 of 27 Old 04-03-2009, 09:12 AM
cody_gs1
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Same, Same. Just bought 2004 and i'm averaging 19.5. I just make it a point to drive easy in town and set the cruise on the hwy. Remember, the faster you go over 55 mph, the more you reduce your mpg. I try to stick to 65/70 mph. And of course maintenance is key!
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post #5 of 27 Old 04-03-2009, 09:15 AM
ben_stewart
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I used to push 18mpg with my jeep. But recently it has dropped to 16.5, which I'm not too happy about. I've kept it maintained and everything throughout its life. Replace distributor cap & rotor, plug wires & plugs, theromostat & water pump...still not much of an improvement. So I wouldn't expect much over 18mpg.

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post #6 of 27 Old 04-03-2009, 09:23 AM
XJH-007
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I get as many MPG's as there are threads per week about this.....

There's a little puzzle for ya...........



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post #7 of 27 Old 04-03-2009, 09:31 AM
jwilly2
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I have a 00 XJ and actually just filled up and checked mileage this morning.... It's consistently in the 16 MPG range and that is all city miles. Today's average was 16.17 MPG
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post #8 of 27 Old 04-03-2009, 10:17 AM Thread Starter
mullins1221
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thx for the replies, looks like I've done about all I can do... I had an old AMC with the straight 6 years ago and it got about 8mpg so I guess I shouldn't complain!
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post #9 of 27 Old 04-03-2009, 10:38 AM
93gc40
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Why do people buy a 10+ year old 4X4 SUV with a 30 year old engine design, think they should get good gas mileage, 15-19 mpg is what XJ was rated new. If you wanted good MPG you should have gotten a Prius. If you are getting 17, thats GOOD. I get 12-15, 4" lift, 30" tires and 3.55 gears.

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post #10 of 27 Old 04-03-2009, 10:57 AM Thread Starter
mullins1221
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wow... was'nt looking to tick anyone off by my question, I aplogize. Simple fact is I've owned a lot of different vehicles with a lot of different engines, but never a jeep and had no idea what to expect. If what I'm getting right now is average, then great. Just wanted to have something to compare to, to make sure everything was running as it should be, as I know that below average fuel economy can often be an indicator of other problems. It was poorly maintained by the previous owner so I'm checking everything- want this one to last me a while.
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post #11 of 27 Old 04-03-2009, 11:15 AM
440_Magnum
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Quote:
Originally Posted by mullins1221 View Post
wow... was'nt looking to tick anyone off by my question, I aplogize. .

Don't worry, I don't think you actually ticked anyone off.

You have to kinda know the history here, there are LOTS of threads where people are griping and moaning about getting th usual 17-19 mpg and saying asinine things like, "if a 2009 Ford Escape can get 25 mpg, why can't my 1999 Cherokee?" Which is a classic case of comparing apples to cow pies. Or something.
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post #12 of 27 Old 04-03-2009, 11:27 AM
BRad704
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with my old 235x75R15's i was getting between 16.5 and 18, depending on A/C and where ive been driving...

NOW with the 31x12.50R15's.... I checked my first tank and got 12.1 mpg... No ac, 50/50 interstate and city driving.
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post #13 of 27 Old 04-03-2009, 11:52 AM
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Quote:
Originally Posted by 440_Magnum View Post
Don't worry, I don't think you actually ticked anyone off.

You have to kinda know the history here, there are LOTS of threads where people are griping and moaning about getting th usual 17-19 mpg and saying asinine things like, "if a 2009 Ford Escape can get 25 mpg, why can't my 1999 Cherokee?" Which is a classic case of comparing apples to cow pies. Or something.
x2. The question just gets a little old after a while, especially when a search for MPG turns up so many results. Oh well.

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post #14 of 27 Old 12-24-2011, 01:15 AM
KPrwivo
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i have a 4.5 inch lift in and am pushing 8 mpg dont know what to do something is wrong
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post #15 of 27 Old 12-24-2011, 03:26 AM
cory4um
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20 on intetstate
15 in town
17 on the countr roads into town or hwy
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