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Old 05-03-2012, 09:54 PM   #61
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It will not use any gas parked in the driveway Get a beater to drive to and from wherever
Go with stock-sized tires, and drive easy if you want better gas mileage, but I don't think Jeep and good Gas mileage goes together atleast with the last 10 or so I have had is has been this way. Tuned-up or not. My 97 ZJ gets 16-18 highway and has seen 20 on one trip, but that is the best I have seen. My 90 YJ gets about 12-14 usually with the 33's and driving easy

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Old 05-03-2012, 11:00 PM   #62
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dang, my 93 zj got 13-15 in town and 20-21 on the highway. stock but i changed the t-case for one from a wrangler so i could put it in 2wd. gas mileage didn;t change at all though, i was bummed.

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Old 05-03-2012, 11:00 PM   #63
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Quote:
Originally Posted by d5string
... My 90 YJ gets about 12-14 usually with the 33's and driving easy
My 95 YJ gets about the same on original (4.10) gearing with 33's on under 2.5L.
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Old 05-08-2012, 04:31 PM   #64
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My 2005 Unlimited is getting 13. My question is do the performance chips you see advertised to improve horsepower and MPG work on the Wrangler?
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Old 05-08-2012, 05:01 PM   #65
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no idea man, have to ask in the section for the newer wranglers. we old jeeps here don;t use chips because ours are either carb'd, or the system is not able to run a chip like that
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Old 05-08-2012, 05:54 PM   #66
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Originally Posted by Bigdoggilly View Post
My 2005 Unlimited is getting 13. My question is do the performance chips you see advertised to improve horsepower and MPG work on the Wrangler?
The so called "performance chips" do very little but toss more gas into your engine. They are merely a resistor that tricks the engine into thinking its running lean, so it dumps more gas in. An idiot will think that "more gas = more power" but it honestly just means less miles per tank, with little to no increase in power. Good way to foul your spark plugs and run your engine worse.

However, there are computerized ignition control systems that do work, as they let the user control how hot or cold his ignition is going to run, and allows slight adjustment of the timing.
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Old 05-09-2012, 11:35 AM   #67
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I guess I am just going to have to be happy with 13 MPG...
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Old 05-09-2012, 11:58 AM   #68
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i am horribly happy with 13. its way better then 9 and 10
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Old 10-12-2012, 04:22 PM   #69
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I'm running an 89 4.2L (258) with a Pugeot 5 speed manual. Running on 30's. With stock emissions


As far as the power band goes, at 55 mph I am hitting 1500-1600 rpm.

I can get 16 mpg when I jack rabbit and rsce from stoplights. I do give my self a lot of stopping distance and clutch coast long brfore I brake. Recently, I got 22 mpg without ghe hardtop on for the summer. Bikini top only.

Sometimes, you will actually get better gas mileage when the Oxygen sensor stops working correctly and leans out the fuel by default.

Also, my year didn't have an automatic altitude adjustment so it needs a jumper installed for 4000+ ft.
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Old 10-13-2012, 06:44 AM   #70
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93 4.0 5-speed
235/75r15 stock hight

I get 17-18 mixed 70%city consistently. i just shift at 2000-2500 and never depress the petal more than 2/5ths.

highway i've gotten 25 on 100% highway with no stops, but i would say 23 average
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Old 10-13-2012, 07:08 AM   #71
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Old 10-13-2012, 08:26 AM   #72
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Remember, when you put larger tires on, the rotation takes longer than the stock ones. Thus, when your speedometer reads 55 MPH you are actually going 60 MPH. That changes your distance as well. If you go ten miles on your big tires, you actually went 13. I am just making the numbers up, you will have to figure out for yourself exactly what that is. Also consider that when buying a used Jeep. YOu have more miles on that engine than you thought.
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Old 10-13-2012, 10:08 AM   #73
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Best way to get better gas mileage is to get another vehicle. You have to remember that a jeep is built for economy. It has the aerodynamics of a shoe box... It is not geared for "highway" speeds. Anything you do to it such as cold air intakes, performance chips, or platinum tip spark plugs are going to give you minimal improvement, if any. Remember, it's built to be all-terrain vehicle.
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Old 05-24-2013, 09:26 PM   #74
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Originally Posted by jeepgazan View Post
Okay guys, i have been reading alot and i have the feeling my jeep isn't performing properly. My MPG is very horrible it's 13 - 14 MPG. I have 31 inch tires, very heavy bumper with a windch i would saw weighs around 3 - 4 hundred pounds. I also don't drive fast max 60 mph. I drive normal only a couple times I speed. on streets i'm always driving 35 mph in 3rd gear and i don't use 5th gear. I have a flowmaster series 44 muffler, and the muffler piping ends right under neith the passenger side seat. I don't have the piping that extends to the rear. Also it's a 4.0L High output recent oil change, engine has 223k miles, recently tuned engine, and rebuilt tranny. gears should be the regular best performance one, i believe 3.57 or something close to this.

Question - What type of gas should I use? 87, 89, 91? Chevron, Shell, Arco?

Question - What type of spark plugs?

Question - What can i do to have the best fuel economy for my jeep? Recommendations please be specific, like brown gas kit what is that?
Lucky! I have a 91 6 cylinder 5 speed with 30 inch tires and 307 or 355 I'm not sure amd I only get 11
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Old 05-24-2013, 11:04 PM   #75
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I get 10 mpg. Period. city or highway. My goal is to get at least 16mpg right now. I have a feeling that something is wrong somewhere and slowly but surely I'm dumping money into it to get it fixed. My 2011 Jeep got 25+ on the highway drive from cali to colorado. While I had to make sure I filled it up every ~180 miles (those uphills). I literally feel like everytime I move my jeep from its parking spot I should make a stop at the gas station currently.
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Old 05-25-2013, 12:15 AM   #76
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what gears are you running? regearing is usually needed when running bigger tires so the engine doesn't work as hard. friend with a 4 cyl gets over 18mpg with 35's. as long as he stays light on the throttle.
How?!?!??! I need to know his secrets lol
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Old 05-25-2013, 02:07 AM   #77
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sounds like i need to do a tune up... I have a 95 2.5L with 33" tires on Dana 60 axles and I get 10-11 MPG (original 4.10 gears... bleh. I am lucky to go faster than 65MPH!)
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Old 05-25-2013, 09:48 AM   #78
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Old 05-25-2013, 02:43 PM   #79
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sounds like i need to do a tune up... I have a 95 2.5L with 33" tires on Dana 60 axles and I get 10-11 MPG (original 4.10 gears... bleh. I am lucky to go faster than 65MPH!)
Kidding... PO put 4.88 gears in the D60 axles.

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