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Old 03-29-2012, 06:24 PM   #1
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1995 Wrangler YJ gas mileage poor

I just bought a 1995 YJ. It looks like it is getting around
12 miles/gallon. With a small V6 I thought
It would get around 17/18 gal. Anyone know
If there is anything I can do to get better gas mileage?

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Old 03-29-2012, 06:30 PM   #2
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Sell it and by a Honda civic.

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Old 03-29-2012, 06:36 PM   #3
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I would start with a tune up. Plugs wires, distributed cap & rotor. A good radiator flush. Check over rubber. A vacuum & fuel lines replace any worn or damaged. Run some seafoam through the gas & oil.

Lastly consider swapping your fluids with royal purple, I gained 2 mpg from the swap in my 350sbc
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Old 03-29-2012, 06:48 PM   #4
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I would start with a tune up. Plugs wires, distributed cap & rotor. A good radiator flush. Check over rubber. A vacuum & fuel lines replace any worn or damaged. Run some seafoam through the gas & oil.

Lastly consider swapping your fluids with royal purple, I gained 2 mpg from the swap in my 350sbc
thats what i was going to say oh and lie to your wife about the mpg
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Old 03-29-2012, 06:48 PM   #5
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What size tires are you running? Any lift? Auto or manual? Check air filter as part of tune up mentioned above.
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Old 03-29-2012, 07:45 PM   #6
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its an inline 6 and is not small, thats part of hte trouble, ha ha ha.

you should get around 17-19 on the highway with a stock automatic 6 cylinder and 14 in town.

be glad you got a newer one, my 87 normally gets around 9-10 but a recent carb and intake swap has so far gotten me into the teens
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Old 03-29-2012, 10:50 PM   #7
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its an inline 6 and is not small, thats part of hte trouble, ha ha ha.

you should get around 17-19 on the highway with a stock automatic 6 cylinder and 14 in town.

be glad you got a newer one, my 87 normally gets around 9-10 but a recent carb and intake swap has so far gotten me into the teens
Beat me to it.........The 4.0 is not a small 6 cylinder, and it is not a v-6 either. Couple that with bad aerodynamics and there you go.......Jeep and good gas mileage is not something that usually goes together. Before buying a foreign car, try doing as suggested, and make sure it is running right. Also if you have bigger tires without re-gearing you will get poor gas mileage
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Old 03-29-2012, 10:56 PM   #8
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Like others mentioned the I6 engines included with Jeeps are BIG engines for 6 cylinders (well... I'm used to ones that weigh almost as much as the whole Jeep does so it's small to me, but nontheless it's a big I6). Do yourself a full tuneup to get back some gas mileage and better performance:

-Replace vacuum lines
-Replace air filter
-Replace fuel filter
-Injector cleaner in full gas tank
-Replace O2 sensor
-Replace MAP sensor
-Replace spark plugs
-Replace spark plug wires (all 7, including coil to dizzy wire)
-Replace Distributor cap
-Replace Distributor rotor
-Oil change (run engine flush through it first)
-Drain and fill transmission, transfercase, and differential fluids with fresh oils.

From there it has to run like new. Another thing, the skinny peddle is skinny for a reason, don't push it too hard
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Old 03-29-2012, 11:29 PM   #9
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Big Tires and lift will kill your MPG.
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Old 03-30-2012, 08:52 AM   #10
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Big Tires and lift will kill your MPG.

BUT WE WOULD'NT HAVE ANY OTHER WAY
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Old 03-30-2012, 01:20 PM   #11
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Thanks for the advice! I plan on putting in a new waterpump, thermostat and serpentine belt....when I have it out, plan on taking Radiator down to shop to have it cleaned real good. Changing all hoses and will make sure I change/review all that you suggested. Not sure of the Purple fluids? Have to check this out. Thanks again!
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Old 03-30-2012, 01:21 PM   #12
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Running 33" Mickey Thompson with 4" lift. Probably one of the problems with the gas mileage.
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Old 03-30-2012, 02:17 PM   #13
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A big help would be to remove the clutch fan and install an electric fan, that clutch fan sucks a good amount of hp and economy from your motor.
Clean air and fuel filters will help.
Regular service.
Remove the top (more important with a heavy hard top).

And the best way to get better mileage!

Dont drive it, get a commuter car for the normal driving, and use the Jeep when its important to look, feel and perform off road well.

Personally, i commute in my YJ, 14 MPG on 33's, with a full hard top.
... and thats better then my wifes Yukon.....
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Old 03-30-2012, 06:19 PM   #14
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^Removing the top actually creates more drag. The short bed and sudden upwards spike with the Jeep shape cause the air to come back down and drag the rear end a bit.
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Old 03-30-2012, 09:08 PM   #15
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and blow everything in the jeep out the doors when you are on the highway, ha ha ha. good for cleaning the interior but bad for important paperwork or a hat you might have on
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Old 03-30-2012, 09:23 PM   #16
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^Removing the top actually creates more drag. The short bed and sudden upwards spike with the Jeep shape cause the air to come back down and drag the rear end a bit.
No, it does not, the back creates a high pressure zone and air blows right over it, just like in a pickup with a tailgate.

I run with a tonneau covering my back end anyways, I like it better when my 12's are out of sight....

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and blow everything in the jeep out the doors when you are on the highway, ha ha ha. good for cleaning the interior but bad for important paperwork or a hat you might have on
Anything important is locked in the console, too bad my 12's dont fit in there....
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Old 03-30-2012, 09:23 PM   #17
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Running 33" Mickey Thompson with 4" lift. Probably one of the problems with the gas mileage.
With stock gears I would say that is your biggest problem. When you service the cooling system as you stated above, make sire you change the t-stat to 195 degree. This is better for gas mileage as well
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Old 03-30-2012, 09:30 PM   #18
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and blow everything in the jeep out the doors when you are on the highway, ha ha ha. good for cleaning the interior but bad for important paperwork or a hat you might have on
Lmao done did that a few times
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Old 03-30-2012, 09:51 PM   #19
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and what sucked, when it blew my hat out, is that it was my favorite hat from when i went to the bmw performance center in south carolina a few years back. it took it off my head and under the back driver's tire. folded the bill almost dead center in half so now it looks like i am one of those dude's who puts his hat in his pocket or whatever. it sits on my rack now, retired from duty.
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Old 04-01-2012, 09:24 AM   #20
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My 2.5 actually gets up to speed better with the top on. I get a lot of drag from the spare. If I remove the spare tire, it does better. This is with a bikini top installed btw
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Old 04-01-2012, 03:50 PM   #21
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My 2.5 actually gets up to speed better with the top on. I get a lot of drag from the spare. If I remove the spare tire, it does better. This is with a bikini top installed btw
Whats a spare? I dont have one, got a plug kit and one of those cheap cig lighter air compressors...
Yea, it takes about 20 minutes to inflate a 33, but its tons better sitting waiting for it to inflate then it is spending all that time jacking up my Jeep, removing the tire and installing the spare, plus the space savings alone is worth it.
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Old 04-01-2012, 09:06 PM   #22
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Whats a spare? I dont have one, got a plug kit and one of those cheap cig lighter air compressors...
Yea, it takes about 20 minutes to inflate a 33, but its tons better sitting waiting for it to inflate then it is spending all that time jacking up my Jeep, removing the tire and installing the spare, plus the space savings alone is worth it.
Yeah that wouldn't work where I wheel. Sidewall cuts will take a lot of plugs It is faster to put on a spare and use the plugged tire as a spare
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Old 04-02-2012, 12:37 AM   #23
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Yeah that wouldn't work where I wheel. Sidewall cuts will take a lot of plugs It is faster to put on a spare and use the plugged tire as a spare
Any serious wheeling, I do HAVE a spare, I just dont normally roll with one.
If im planning on doing anything too hairy, Ill bring it.
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Old 04-02-2012, 12:45 AM   #24
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No, it does not, the back creates a high pressure zone and air blows right over it, just like in a pickup with a tailgate.
I knew someone was going to make the pickup reference... Pickups are aerodynamically designed to create an air bubble inside of the bed which causes moving air to slip right on over the bed, as if the truck were a van. Jeeps are not designed like this, the upwards spike of the windshield actually causes the air to create a lot of turbulence coming off of a sudden sharp edge which fills the cab and creates more drag. Components like the roll bar and even the rear seat actually create more drag on it as well.

Having the soft top on or even a Bikini top on causes the air to roll off of the windshield a lot smoother and make for a more aerodynamic design. You can actually see a bit of this pressure zone moving over the soft top on the highways, with the top being sucked up.

It was actually quite an interesting article I read on one of these forums, even had videos of Jeeps in wind tunnels.. And I know it has a lot of validity to it. With the top off my Jeep I've noticed that I have to put my foot into it more just to get up to highway speeds, and hold them compared to having the top on. Part of the reason why I like rolling with my Bikini top on. Not only does it provide shade, but it's been aerodynamically proven to decrease drag.
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Old 04-03-2012, 12:07 AM   #25
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....
Having the soft top on or even a Bikini top on causes the air to roll off of the windshield a lot smoother and make for a more aerodynamic design. You can actually see a bit of this pressure zone moving over the soft top on the highways, with the top being sucked up. ....
Yes, I roll with a Bikini top too, I dont think logically anyone would not use one, unless they are mental, or just like wasting fuel, my post assumes there is one in place.....
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Old 04-03-2012, 06:44 AM   #26
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There's one thing that must also be considered, if its on 33 with stock gears was the speedometer gear ever changed if not the odometer will not be accurate. I know mines off by 1.15 so I have to multiply my trip odometer by that to get my actual mileage. Easiest way is to grab a gps and drive 10 miles according to the jeep and see what the gps says. That is unless you know the speedo gear was changed.
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Old 04-03-2012, 10:54 AM   #27
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Thanks for the suggestions. Not worried about the MPG....just wondering if it was normal. I will try and do the tune up you suggested. Thanks for all of the advice.
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Old 04-03-2012, 10:55 AM   #28
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Good question! I bet you are correct. They probably did the 4 inch lift, added new 33 in tires and never adjusted the odometer. Will check it out.
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Old 04-03-2012, 11:45 AM   #29
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Yes, I roll with a Bikini top too, I dont think logically anyone would not use one, unless they are mental, or just like wasting fuel, my post assumes there is one in place.....
Well yes, but I posted incase others are wondering. I took my top off yesterday and absolutely noticed a difference in road characteristics right away. No longer could hit 65mph where I normally am already at 70mph, so the bikini top is going on today.

Rolling without the top on is a bit more fun though, granted it's not on the highways..

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