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Unread 07-12-2010, 02:20 PM   #1
celticluck713
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1994 YJ Wrangler 
 
Join Date: Oct 2009
Location: nj
Posts: 167
mpg gasss ughhhhh

so yeah i know that boxes are so aerodynamic but 13 mpg city on a 94 4cyl manual? and i get like 12 1/2 highway but i think thats understandable cause i usually drive at about 3k rpms on long trips
let me know what you guys think and is there any mods that will boost it a little like an air intake... i know its not gonna be a smart car but would like to get a little bit better considering i drive back and home from shore usually once a week thanks guys

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Unread 07-12-2010, 02:27 PM   #2
93iroZJ
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1993 YJ Wrangler 
 
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I have a 93 wrangler 4cyl with a 5in lift and 35" tires and I get 12 highway 10 city lol
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Unread 07-12-2010, 02:51 PM   #3
Sleuthhound
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1991 YJ Wrangler 
 
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91 4L 31" tires, 4" lift, stock 307 gears... 14 (Vancouver - Logan Lake) / 20 (Logan Lake - Vancouver) mpg highway, 12-13mpg city.

There's a few things you sacrifice when you buy a jeep. Gas mileage, speed, and passing people.
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Unread 07-12-2010, 02:54 PM   #4
ImpactFabWorks
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Quote:
Originally Posted by Sleuthhound View Post
There's a few things you sacrifice when you buy a jeep. Gas mileage, speed, and passing people.
hey I passed a small child on a tricycle this morning
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Unread 07-12-2010, 02:55 PM   #5
celticluck713
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Yeah I have 0 lift and I have 31s
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Unread 07-12-2010, 04:06 PM   #6
Sleuthhound
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Quote:
Originally Posted by ImpactFabWorks View Post
hey I passed a small child on a tricycle this morning
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Unread 07-12-2010, 04:12 PM   #7
MoparFreak69
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1990 YJ Wrangler 
 
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Location: Boise, Idaho
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Quote:
Originally Posted by Sleuthhound View Post
There's a few things you sacrifice when you buy a jeep. Gas mileage, speed, and passing people.

Hmm, only if you only stay on the beaten path. If you toss a few dollars toward a different motor you can have all 3. I got 20MPG out of my 5.2, can stomp anything under a hot mustang/camaro/charger type of rig and can easily cruise 80 down the highway if I want. If I keep it at a leasurly 65 on the highway I can get 18 MPG out of it no problem.
In reality the only thing you can do to help increase your mileage with the 4 banger is a light right foot, take all the weight out of your Jeep as you possibly can (remove back seat, no top/doors, etc) to make that motor work as little as possible to get you up to speed. You might also consider going to a bit smaller of a tire, which will help 2fold, less rotating mass and less friction.
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90 YJ 5.2 Magnum, AX-15, 231 SYE'd
D44 front, welded/trussed AMC20HD rear. 4.56 gears soonish.
Western 6 lug aluminum wheels, with 35x12.50x15 Wrangler MTRs
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Unread 07-12-2010, 04:13 PM   #8
MJMPC
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What trans what gear ratio how much air perssure are you running in you tires?
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Unread 07-12-2010, 04:37 PM   #9
Roadyy
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1994 YJ Wrangler 
 
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Have you checked your CEL for codes. I am running the exact same setup as you and I'm averaging 19mpg.
I would be willing to bet you get a CO2 sensor code.

MJMPC he is going to have 4.10 gears with an ax-5 if it's stock. 4cyl 5 sp came with that factory setup. Even if he has too much air pressure he should still get pretty close to mine.

Last edited by Roadyy; 07-12-2010 at 04:39 PM.. Reason: no need for 2 posts
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Unread 07-12-2010, 07:39 PM   #10
hesserdude07
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1993 YJ Wrangler 
 
Join Date: Aug 2009
Location: Bloss, PA
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With a 2.5" lift and 31" TrXus MTs. Winch, 2 built bumpers, tire swing....etc.
I was getting about 18mpg.
-I run a air intake, 4.0 TB, pace setter header, 8mm wires, Champion plugs, and free flow exhaust.
4.5" lift and 35" TSLs i still get 13mpg. But im going to a 5.2L this fall, like Mopar... I cant wait to have to ability to GO fast if i want!!
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Unread 07-12-2010, 09:02 PM   #11
MoparFreak69
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by hesserdude07 View Post
im going to a 5.2L this fall, like Mopar... I cant wait to have to ability to GO fast if i want!!
OOOOOOOOHHHHHH MAAAAAAAN just wait until you take that first drive. I still grin ear to ear from how much power I have available whenever i need it!!!!!!! Even with the stock 4 banger muffler it has a nice tone to it. Its quiet enough to where people dont know what you did until you fly past them and they still dont know what the heck happened lmao!
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90 YJ 5.2 Magnum, AX-15, 231 SYE'd
D44 front, welded/trussed AMC20HD rear. 4.56 gears soonish.
Western 6 lug aluminum wheels, with 35x12.50x15 Wrangler MTRs
[SIZE="5"][URL="http://www.jeepforum.com/forum/f22/myj-build-2-years-ago-today-1197236"]MYj Build[/URL][/SIZE]
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Unread 07-12-2010, 10:13 PM   #12
wrangler76
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Location: Carson, WA
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My 4.0 gets ok gas milage and power.... when driving down hill..... with a tail wind..... while drafting a semi
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Unread 07-12-2010, 10:27 PM   #13
BBerry4430
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2006 LJ Wrangler 
 
Join Date: Jun 2010
Location: Newport News, VA
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How long has it been since your last tune-up? I'm also getting 19-20 mpg city and maybe 21 highway with the 4cyl 5MT set-up. Agreed about gears. Changing gears can have a big impact on gas mileage.
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Unread 07-12-2010, 11:04 PM   #14
BlackRhino
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1991 YJ Wrangler 
 
Join Date: May 2007
Location: Prescott, Arizona
Posts: 921
I got 17 mpg city/highway combined when my engine was worn and had a bad compression leak. Now that it's rebuilt I get over 20 mpg. 13 mpg on a stocker means there's something wrong somewhere.
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Unread 07-12-2010, 11:24 PM   #15
Sparkfly88
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1989 YJ Wrangler 
 
Join Date: Mar 2010
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I was getting under 12 city, till I did a fuel filter, cap, rotor and plugs, all OE nothing special and it brought me to 14.9 city.

89' 4 banger stock lift rubbing 31x1050x15s

I have an App for my iphone that tracks every cost of my vehicle I input, every time I gas up it keeps it logged.

It was fun watching my MPG go up after I did something to it
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