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Old 04-10-2011, 02:47 AM   #1
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hellllppp!!!!

how can i get better mpg in my 89 wrangler 2.5 liter 4 banger

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Old 04-10-2011, 02:50 AM   #2
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Start off with a simple tune up and clean the carb

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Old 04-10-2011, 02:52 AM   #3
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its tbi any thing else
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Old 04-10-2011, 03:12 AM   #4
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When it comes to fuel mileage there's really not a whole lot u can do short of keeping it tuned, running a thin oil in your differentials, etc. unless you have a rough idle problem or something of that sort.

Yeah u can give it a new air intake and change gears, change exhaust yadda yadda yadda but the 1mpg you'll gain isn't going to justify the cost. If your engine and Jeep in general are in good shape, only thing you can really do is maybe slow down a little bit.

By TBI do you mean "to be inspected"? If that's the case are you having trouble passing emissions? State inspection shouldn't care about fuel efficiency, and if they do...this country is in trouble lol
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Old 04-10-2011, 06:23 AM   #5
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TBI means Throttle Body Injection. Injector in a Carb like orifice instead of a venturi.
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Old 04-11-2011, 10:32 AM   #6
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same as any other vehicle...

check your tire pressure. Even two pounds low in one of the tires can cause enough drag to drop 1-3mpg.

tune-up (air filter,oil change,spark plugs,cap and rotor)

and if you really want to, you could make an arrow shape out of a refridgerator box and duct tape it to the front of the jeep like a big cone.
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Old 04-11-2011, 10:48 AM   #7
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same as any other vehicle...

check your tire pressure. Even two pounds low in one of the tires can cause enough drag to drop 1-3mpg.

tune-up (air filter,oil change,spark plugs,cap and rotor)

and if you really want to, you could make an arrow shape out of a refridgerator box and duct tape it to the front of the jeep like a big cone.
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Old 04-13-2011, 09:21 AM   #8
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i get 9 mpg is that normal??
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Old 04-13-2011, 09:53 AM   #9
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Try driving 55-60 instead of 65-70 on the highway... I've picked up almost 1 mpg just by doing this if your not already... Remember just because 65 is the posted speed limit, doesn't mean that its the minimum speed limit... I know that its 40 around here because I was doing 35 trying to limp a vehicle to the garage... 1 exit was all I had to travel and there just happened to be a cop in that span of highway...
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Old 04-13-2011, 12:12 PM   #10
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Try putting 93 octane in every 3rd tank or so. Wait till it's almost empty first. This has boosted mine from about 14-15 up to 19-20.
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Old 04-13-2011, 10:32 PM   #11
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i run permo all the time for gas does that make a huge difference in milage ? i have a 93 yj
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Old 04-13-2011, 11:48 PM   #12
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my jeep only doess 55 lol and are u sure that gas thing works??
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Old 04-14-2011, 12:11 AM   #13
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I have a 93 and I usually get about 19 mpg. Has been as low as 14 when I was in a hurry, and as high as 24 when I had a nice tail wind. I run 30" tires.

What kind of tires do you have? Also, manual or auto? What kind of driving: trail, highway, city? Also, is your odometer accurate? You may be traveling more miles than you think if you changed to a larger tire and didn't change the speedo gears.
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Old 04-14-2011, 12:13 AM   #14
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I have a 93 and I usually get about 19 mpg. Has been as low as 14 when I was in a hurry, and as high as 24 when I had a nice tail wind. I run 30" tires.

What kind of tires do you have? Also, manual or auto? What kind of driving: trail, highway, city? Also, is your odometer accurate? You may be traveling more miles than you think if you changed to a larger tire and didn't change the speedo gears.
highway and city i drive 33 mud tires 4 banger it costs me 30$ everytwo days to get to school and work
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Old 04-14-2011, 12:14 AM   #15
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Higher octane will give you more MPG. Sometimes it is cheaper to go higher octane than lower over the long run. Your results may vary.

If you can only get up to 55 it sounds like you may be a bit under powered for your tire size. A tune up may help your power output. more power means the engine doesn't have to work as hard to achieve the same results. That is why the I6 often make better MPG than the 4 cylinder.

If you have an automatic, they inherently get worse gas mileage than a manual.

You also have to look at how you are accelerating. If you are trying to keep up with or show-off to the girl or guy in the rice rocket next you, you are pretty much just eating up your fuel. If you are driving in city traffic, stop and go, you are eating up fuel by not going anywhere. Or worse going nowhere, then accelerating to the next parking space.
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Old 04-14-2011, 12:24 AM   #16
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You might consider smaller tires, or a change in gearing. The 4 cyl. has to work hard with the original size tires, which were probably 28 inches or so. And with 33s, it is really working hard.

I have tried different octane in mine. The book says use 87 minimum. I have tried 85.5, 86, 87 and 88. I get the best mileage with 87 (what it recommends in the owner's manual) but can only get 88 in New Mexico. If i try to use 86 or 85.5, the engine REALLY struggles.
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Old 04-14-2011, 12:31 AM   #17
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Higher octane will give you more MPG.
NO. No. No. This is one of those "common wisdom" things that is not correct.

Quote:
Originally Posted by Undead-89 View Post
You also have to look at how you are accelerating. If you are trying to keep up with or show-off to the girl or guy in the rice rocket next you, you are pretty much just eating up your fuel. If you are driving in city traffic, stop and go, you are eating up fuel by not going anywhere. Or worse going nowhere, then accelerating to the next parking space.
This is totally correct. Four cylinder jeeps are frequently driven much harder than 6 cylinder models. They are stomped and thrashed. The people who work on "hyper-mileage" try as hard as possible to avoid stopping, or slowing, or especially braking. They try for as consistent a speed as possible. They accelerate away from the lights as slowly as possible.
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Old 04-14-2011, 12:36 AM   #18
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I put a little yellow ball on top of my radio antenna. I can accurately judge what my mileage is going to be by watching that ball. If I have a nice tailwind, the ball barely moves and I get really good mileage. If the thing is banging into my window about halfway down, I will get really BAD mileage. If I am fighting a huge headwind, I can slow down until the ball settles down a bit to improve mileage.
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Old 04-14-2011, 12:44 AM   #19
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^ rmed4defense: that's funny.

There is a long steep pass here in Colorado. On the way down, in my Grand Cherokee, I get 90+ MPG (according to my little display). That's because I'm basically idling/coasting, and doing about 70 miles per hour. In my Honda Civic, it's probably about 120 MPG for that particular stretch.

In my old CJ7, I swear I need to use the gas peddle just to keep going, even on that downhill.

Four wheel drive drag, big tires, horrible aerodynamics, "dirty" air from winches and high ground clearance. Low pressure tires. Every single thing about a Jeep is exactly the opposite of what they do for good MPG cars.
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Old 04-14-2011, 12:50 AM   #20
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I'm in Denver right now. But not in my jeep . Had to drive my gf here for training and am in a 4wd Chevy Suburban. It got 16 or 17 mpg on the way up from NM.
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Old 04-14-2011, 06:12 AM   #21
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Thing to consider about your fuel mileage
1.Gear ratio and tire size if you have a poor gear ratio your fuel mileage will suck (You need to find a ratio that works with 33's )
2. Check all the tune up parts (spark plugs,plug wires, cap and rotor ,Air filter and fuel filter )
I have also noticed that the O2 sensor will not completely fail but wear out over time . This will cause poor fuel mileage (This is not every case )

The only proper way to check the O2 is compare Data for m the ECU and at the sensor .
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Old 04-17-2011, 01:55 AM   #22
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anything else?
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Old 04-17-2011, 03:35 AM   #23
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anything else?
Next time you're out, do a fill to fill mpg check to see what you're getting on the highway. And let us know what mph you drove at and how hilly it is where you drove. 9mpg is awfully low even for your engine/tire size. Also are you sure your odometer is accurate? Bigger tires without changing the speedo gear WILL throw off your speedo and odometer.
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Old 04-17-2011, 09:51 AM   #24
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ok and when i shift from third to fourth i smell raw fuel pritty bad does this mean anything?
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Old 04-17-2011, 03:57 PM   #25
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ok and when i shift from third to fourth i smell raw fuel pritty bad does this mean anything?
help
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Old 04-17-2011, 08:57 PM   #26
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i need some help guys
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Old 04-17-2011, 09:37 PM   #27
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try seafoam

go to the parts store and get some seafoam, follow the directions and put some in your gas tank and some in your oil and then change your oil after about 20 miles. seafoam will clean the heart and lungs of your jeep out and you will probably, maybe get better gas mileage.
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Old 04-18-2011, 05:37 PM   #28
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The smell of raw fuel may be caused by several things . find somebody with a factory scan tool and get the data stream pulled up and have them check to see if anything is out of spec

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