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Old 09-07-2007, 05:40 AM   #1
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Gas Mileage is poor

anyone got any help? i've changed plugs, air filter, oil & filter....my diesel 7.3 gets better gas mileage than my 4.0 Wrangler....love my Jeep, just thought the gas mileage would be better than 14 on the highway....

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Old 09-07-2007, 05:44 AM   #2
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14 on the highway? Thats odd, what's the speed you stay at on the highway?

Use less of the skinny, also what year? Some details about this monster?

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Old 09-07-2007, 05:48 AM   #3
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2004 Sport Wrangler, speed around 70....what is "less of the skinny"? really didn't watch the speed so much as just trying to keep it below 2,000 rpms....
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Old 09-07-2007, 05:55 AM   #4
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With my 2005 4.0L I get 20 on the highway.
That's with stock 30's on it and driving around 70.
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Old 09-07-2007, 06:01 AM   #5
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its got to be the tires.....i don't know whats on them now, but they're not stock.
you think that could change the gas mileage that much?
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Old 09-07-2007, 06:01 AM   #6
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From what iv read 55-60 is the most efficient speed for saving gas. When I hit the highway thats my maximum speed, and iv noticed abit of an increase.

Less of the skinny means get your foot off the gas pedal! =P

Change your driving habits, let off the gas and let it start to slow down before you hit your breaks.

If your going to idle for more then a few mins, turn it off.

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its got to be the tires.....i don't know whats on them now, but they're not stock.
you think that could change the gas mileage that much?
Could be the problem as well, is there a lift on the jeep?

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Old 09-07-2007, 06:04 AM   #7
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hey, thanks a bunch for the info....my husband didn't think anyone would answer me.
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Old 09-07-2007, 06:08 AM   #8
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no lift on the jeep.....and the tires are not that big.. i've seen much bigger....just obviously wider than the spare on the back. he changed everything he could think of to change. we do both drive with heavy foots, but my gosh, 10 in town and maybe, maybe 15 on the highway.....i was disappointed. went to Oklahoma this last week from here in Corpus Christi and each tank was only getting between 14 to 15 mpg......
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Old 09-07-2007, 06:08 AM   #9
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hey, thanks a bunch for the info....my husband didn't think anyone would answer me.
Hehe, I figured I would help before I went to bed.

Just remember your driving the equivalent of a brick, your not going to get 60mpg. Average get about 15ish town, and 20ish highway.

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no lift on the jeep.....and the tires are not that big.. i've seen much bigger....just obviously wider than the spare on the back. he changed everything he could think of to change. we do both drive with heavy foots, but my gosh, 10 in town and maybe, maybe 15 on the highway.....i was disappointed. went to Oklahoma this last week from here in Corpus Christi and each tank was only getting between 14 to 15 mpg......
When you hit the highway stay about 55-60mph and ease up on the pedal in town for a tank and see what the difference is.

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we do both drive with heavy foots
That tends to be everyones issue, I know I have to tell my self no! Still think theres something odd, maybe someone else will post with some ideas.


~Lev
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Old 09-07-2007, 07:28 AM   #10
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Hehe, I figured I would help before I went to bed.

Just remember your driving the equivalent of a brick, your not going to get 60mpg. Average get about 15ish town, and 20ish highway.



When you hit the highway stay about 55-60mph and ease up on the pedal in town for a tank and see what the difference is.


That tends to be everyones issue, I know I have to tell my self no! Still think theres something odd, maybe someone else will post with some ideas.


~Lev
The only other recommendation I can think of is to use the cruise, ALWAYS! As soon as you get up to 60-ish, set the cruise and keep your foot out of it as much as you can! As stated above, you are driving the equivalent of a shed, only so much you can do!

Oh, check your tire pressure! Tires too soft will eat gas too!
I drove mine to Silver Lake last month and when on the highway in MI, had to drive like a bat outta hell just to keep from getting run over, mileage was in the single digits! That really hurt!
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Old 09-07-2007, 08:10 AM   #11
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was the top on or off? I have a 97 4.0 with 3spd auto and 3.07 gears on stock tires... With the top up i get 17-18 average... put it down and i get 15 average. Also, atmospheric copnditions can play hell on your rig. When its hot you will lose some fuel economy.

But to reiterate what has already been stated... take it easy on teh gas pedal and you will save your wallet.
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Old 09-07-2007, 11:26 AM   #12
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Change the 02 sensor....... I have the 4 banger and I was getting about 12 mpg and I changed the front O2 sensor and Got a bunch of things better. Better power, Better Gas milege, easier starting, even idle.

Hell.... give it a full tune up!!
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Old 09-07-2007, 07:22 PM   #13
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Something I've run into in the past is that premium fuel can cause a drop in mileage. Most modern fuel injected vehicles are set up to run on 87 octane, while some performance models are set up to run on premium. I've had a Z28 for several years, which requires premium, and there's been a few times that I've picked up the premium nozzle out of habit and filled up my truck/jeep/daily driver with the expensive stuff. Every time I've done that I've seen a drastic drop in mileage, usually 60-80 miles per tankfull. I had an '04 TJ when Hurricane Dennis came through in July of '05. During the gas shortage that's generally part of the aftermath of hurricanes around here, I had no choice but to fill it up with premium one time, as that was the only grade they had. My mileage dropped from 16 to 13. If you happen to be running premium, you may want to consider running a few tanks or regular through it and recheck the mileage.
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Old 09-08-2007, 07:17 AM   #14
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Make sure you have the proper speedo gear first. If you are running larger then stock tires. Inaccurate gear= inaccurate mileage reading. If you have the correct gear then I have found I get the best mileage at about 2500 RPM's on my 4.0.
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Old 09-08-2007, 10:59 AM   #15
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My 01 Sport 53K mi. auto (3 speed) Std tires gets 17MPG at 70MPH. Slowing it to 55 MPH it gets 23MPG on cruise with A/C on. But the 06 Rubi with auto and 7K mi. is getting 14 MPG at 70MPH.
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Old 09-08-2007, 01:50 PM   #16
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Another small suggestion to look into that could help, even just a little, is be mindful of where you buy your gas. My Wrangler does much better on BP or Shell, but not Mobil or Texaco, go figure. I just filled up and I did 280 miles on one tank, 17.5 miles to the gallon city. That was Shell. I also just did an oil and filter change, and made sure all my tires were pumped to the correct PSI. Other than that, could the vehicle be running rich and burning more gas quicker?? Just throwing ideas out there!!!!
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Old 09-08-2007, 05:57 PM   #17
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Quote:
Originally Posted by GixxerRider View Post
My Wrangler does much better on BP or Shell, but not Mobil or Texaco, go figure.

Here in my area few of the gas stations (citgo and marathon to be exact) used to mix the gasoline with something else. My old car ran like a v8 with that gas and was lacking power so i needed to step on it more which made my mpg go down a lot. It felt like there was water in it.
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Old 09-08-2007, 06:28 PM   #18
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Quote:
Originally Posted by LITTLEMAX View Post
its got to be the tires.....i don't know whats on them now, but they're not stock.
you think that could change the gas mileage that much?
Yes, you stated 70 MPG and under 2000 RPM's. You have larger tires and not the gear ratio to fit. The sweet spot of the 4.0 engine is 2400 RPM's. Your straining the engine a little and it's affecting your mileage
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Old 09-08-2007, 06:38 PM   #19
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How about when driving in lower speeds? 30-40mph? whats the sweet spot for those? 4th or 5th?
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Old 09-08-2007, 08:39 PM   #20
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You mentioned that the tires are not stock; can you check what they are? I'm wondering if they were changed to larger without adjusting your speedo. That and maybe the tires aren't aired up enough...

10 in town and 15 on highway sounds low. For reference, I run 35's with 4.10's and a ton of addons (= weight) and pull around 14 in town...and (don't tell the wife) I'm very heavy on the skinny pedal.
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Old 09-09-2007, 08:22 AM   #21
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You mentioned that the tires are not stock; can you check what they are? I'm wondering if they were changed to larger without adjusting your speedo. That and maybe the tires aren't aired up enough...

10 in town and 15 on highway sounds low. For reference, I run 35's with 4.10's and a ton of addons (= weight) and pull around 14 in town...and (don't tell the wife) I'm very heavy on the skinny pedal.
Shhhh... we won't tell, your secret is safe w/ us, since I'm sure she has no idea!


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And the most important safety, I never put my booger hook on the bang switch unless I'm ready to fire.
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