mpg gasss ughhhhh - JeepForum.com
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post #1 of 21 Old 07-12-2010, 01:20 PM Thread Starter
celticluck713
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1994 YJ Wrangler 
 
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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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post #2 of 21 Old 07-12-2010, 01:27 PM
93iroZJ
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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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post #3 of 21 Old 07-12-2010, 01:51 PM
Sleuthhound
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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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post #4 of 21 Old 07-12-2010, 01:54 PM
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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post #5 of 21 Old 07-12-2010, 01:55 PM Thread Starter
celticluck713
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Yeah I have 0 lift and I have 31s
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post #6 of 21 Old 07-12-2010, 03:06 PM
Sleuthhound
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Originally Posted by ImpactFabWorks View Post
hey I passed a small child on a tricycle this morning
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post #7 of 21 Old 07-12-2010, 03:12 PM
MoparFreak69
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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.

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
MYj Build
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post #8 of 21 Old 07-12-2010, 03:13 PM
MJMPC
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What trans what gear ratio how much air perssure are you running in you tires?

MIKE

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post #9 of 21 Old 07-12-2010, 03:37 PM
Roadyy
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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 03:39 PM. Reason: no need for 2 posts
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post #10 of 21 Old 07-12-2010, 06:39 PM
hesserdude07
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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!!

1993 Silver YJ. SBC 300hp. 700r4. NP231 hybrid. 35" Mud Terrains. 7" Toyota Basterd packs. 8.8 Welded. D30 loc-rite. 1" body lift. 4" LED tails. Custom bumpers. Warn M8000. Hella's. (Trail rig)
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post #11 of 21 Old 07-12-2010, 08:02 PM
MoparFreak69
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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!

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
MYj Build
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post #12 of 21 Old 07-12-2010, 09:13 PM
wrangler76
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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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post #13 of 21 Old 07-12-2010, 09:27 PM
BBerry4430
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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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post #14 of 21 Old 07-12-2010, 10:04 PM
BlackRhino
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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.

Black '91 YJ, pretty much stock for now. Finished engine rebuild. Runs beautifully.
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post #15 of 21 Old 07-12-2010, 10:24 PM
Sparkfly88
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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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