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Unread 03-07-2013, 06:23 AM   #16
caoboy
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1991 YJ Wrangler 
 
Join Date: Jul 2012
Location: Modesto, CA
Posts: 325
Last I checked was 14.7. Mostly city. I've changed an O2 sensor since then, and am tuning it up. I'll report back when I fill up again. Might be a while, I don't daily my Jeep (yet).

2.5/31's/5spd/4.10's

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Unread 03-07-2013, 08:22 AM   #17
pete1991YJ
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1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,629
Quote:
Originally Posted by zombiechief View Post
I'm getting about 12 with a 2.5 5sp and 4:10's on 32" Cooper Discoverys. I would LOVE to get 20 out of my squirrels.....
Sounds like its time for some tune-up work. That made all the difference in the world on mine. Especially all the vacuum lines and various small leaks. Plus the fact that my PO really took care of it. He wheeled it, but he also maintained it. I got all the reciepts and record from him.

Getting 20 is pretty good, they were rated for that when they were brand-new.
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Last edited by pete1991YJ; 03-07-2013 at 08:23 AM.. Reason: sp
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Unread 03-07-2013, 08:44 AM   #18
zombiechief
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1990 YJ Wrangler 
 
Join Date: Aug 2012
Location: Pensacola, FL
Posts: 309
Quote:
Originally Posted by pete1991YJ View Post

Sounds like its time for some tune-up work. That made all the difference in the world on mine. Especially all the vacuum lines and various small leaks. Plus the fact that my PO really took care of it. He wheeled it, but he also maintained it. I got all the reciepts and record from him.

Getting 20 is pretty good, they were rated for that when they were brand-new.
About the only thing I have not replaced is the o2 sensor. I did all the vacuum lines and a full tune up on it when I got it. The previous owner had it sitting up for about 8 years. Before they parked it it was a tow behind for their RV.
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Unread 03-07-2013, 08:51 AM   #19
Chrisnvegas
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1992 YJ Wrangler 
 
Join Date: Dec 2012
Location: Las Vegas, Nv
Posts: 1,160
8-18 mpg. @8 mpg at the dunes. Ran through 3 tanks of fuel. But I was on it all the time in deep sand climbing huge dunes. It gets up to 18 on the hwy if I keep the speed around 55-60. It drops like a rock as I near 70, and at 75+ forget it.
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Unread 03-07-2013, 09:03 AM   #20
joey48442
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1993 YJ Wrangler 
 
Join Date: Mar 2009
Location: holly
Posts: 157
I've been getting 18-19 pretty consistently. That's according to my gps, not the trip odometer, which shows 3percent low. Mine is 1993 2.5 5 speed with 225/75 hankook winter ipikes, which are incredible in the snow, but I imagine heavy and sticky which hurts mileage. I hope to hit 20 in the summer.


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Unread 03-07-2013, 09:39 AM   #21
pete1991YJ
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1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
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Quote:
Originally Posted by zombiechief View Post
About the only thing I have not replaced is the o2 sensor. I did all the vacuum lines and a full tune up on it when I got it. The previous owner had it sitting up for about 8 years. Before they parked it it was a tow behind for their RV.
And yet the O2 sensor is the #1 thing that determines your fuel mileage, after gears and tires.
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Unread 03-07-2013, 10:02 AM   #22
jamesbland123
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1987 YJ Wrangler 
 
Join Date: Jan 2012
Location: Newbury Park, CA
Posts: 62
So you guys getting over 15 with larger tires did you regear your speedo? I'm getting 14 mpg on a 4.2 MPFI that's been recently tuned including new injectors, new tank, plugs, etc... I'm happy with the results but I just don't see how people are getting close to 20 mpg if gearing and numbers are correct.

Then again I'm in CA and if I took off the cat, ran a simple breather, and got rid of the charcoal canister I may be able to get a few more miles out of it.
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Unread 03-07-2013, 10:27 AM   #23
pete1991YJ
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1991 YJ Wrangler 
 
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Location: Niagara Falls, NY
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Quote:
Originally Posted by jamesbland123 View Post
So you guys getting over 15 with larger tires did you regear your speedo? I'm getting 14 mpg on a 4.2 MPFI that's been recently tuned including new injectors, new tank, plugs, etc... I'm happy with the results but I just don't see how people are getting close to 20 mpg if gearing and numbers are correct.

Then again I'm in CA and if I took off the cat, ran a simple breather, and got rid of the charcoal canister I may be able to get a few more miles out of it.
Actually the smog stuff doesn't make much difference to the MPG's. I'm in NY and we have smog inspection now too, in addition to the mech/safety.

My speedo isn't changed, but it it was I would get even more. The thing is, I have the 2.5 MPFI, its smaller, and I drive like a granny cuz it doesn't have any power. I never go over 55 or 60, and I never pass anyone. The limit is 65 anyhow, so who cares? I never give more than 1/2 throttle. I keep it *extremely* tuned up and tight. The bigger tires helps with the MPG's also because the give an effectively higher gear.
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Unread 03-07-2013, 10:35 AM   #24
The1AndOnlyBug
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1994 YJ Wrangler 
 
Join Date: Aug 2008
Location: Ft. Carson, CO
Posts: 198
Quote:
Originally Posted by jamesbland123 View Post
So you guys getting over 15 with larger tires did you regear your speedo? I'm getting 14 mpg on a 4.2 MPFI that's been recently tuned including new injectors, new tank, plugs, etc... I'm happy with the results but I just don't see how people are getting close to 20 mpg if gearing and numbers are correct.

Then again I'm in CA and if I took off the cat, ran a simple breather, and got rid of the charcoal canister I may be able to get a few more miles out of it.
I use my GPS to find out how far I've driven.
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Unread 03-07-2013, 11:02 AM   #25
Ripper3494
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1994 YJ Wrangler 
 
Join Date: Jan 2010
Location: Warrenville, Illinois
Posts: 5,675
Quote:
Originally Posted by jamesbland123 View Post
So you guys getting over 15 with larger tires did you regear your speedo? I'm getting 14 mpg on a 4.2 MPFI that's been recently tuned including new injectors, new tank, plugs, etc... I'm happy with the results but I just don't see how people are getting close to 20 mpg if gearing and numbers are correct.

Then again I'm in CA and if I took off the cat, ran a simple breather, and got rid of the charcoal canister I may be able to get a few more miles out of it.
Yep my speedo is correct, I actually use the mpg reading directly from my pcm

Probably sent from under my broken heep
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Unread 03-07-2013, 09:20 PM   #26
imstillatwork
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1993 YJ Wrangler 
 
Join Date: Aug 2009
Location: Oregon Coast, Oregon
Posts: 1,469
2.5l
235,000 miles
33x12.5 @ 22lbs
4.88 gears
12-14MPG
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Unread 03-08-2013, 04:34 AM   #27
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 4,828
4.2
Nuttered
BBD
235 tires
18 city, 22 highway
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Unread 03-08-2013, 04:48 AM   #28
grizzlycb
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Join Date: Feb 2013
Location: Mount Washington, Kentucky
Posts: 16
I drive a 92 2.5 5speed. Standard gearing with soft top 31x10.5 mud tires. Full size spare and a smitty built stinger. Last time I checked I got 11-12 on high way and closer to 15 in the city. I also have a hole in my header and hole in muffler. (Luckily my new headers came in yesterday and my muffler will be here tomarrow) I just assumed there is no such thing as good gas mileage in a jeep though. There's no fun in good gas mileage. Lol
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Unread 03-08-2013, 04:54 AM   #29
superj
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1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,449
9-11 mpg

4.5 with a four barrel and needing a tune up while running almost 32s (worn out)
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Unread 03-08-2013, 05:53 AM   #30
rodgers3
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1992 YJ Wrangler 
 
Join Date: Mar 2012
Location: imperial, missouri
Posts: 1,048
Quote:
Originally Posted by grizzlycb View Post
I drive a 92 2.5 5speed. Standard gearing with soft top 31x10.5 mud tires. Full size spare and a smitty built stinger. Last time I checked I got 11-12 on high way and closer to 15 in the city. I also have a hole in my header and hole in muffler. (Luckily my new headers came in yesterday and my muffler will be here tomarrow) I just assumed there is no such thing as good gas mileage in a jeep though. There's no fun in good gas mileage. Lol
This^^^
I check mine every now and then just to see what its getting.
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