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Old 07-11-2007, 09:10 PM   #1
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Fuel Mileage Survey

Anybody know what the estimated fuel mileage was on their fuel injected 4 cylinder YJ when it was new? What are ya'll getting for mileage now with your lift kits and larger than stock tires? My engine runs great, (as far as 4 cylinders go), and I have 31x10.50's. I've removed the spare tire and carrier and anything else I felt I could live without in an attempt to cut weight but still can't get much better than 11 miles per gallon. Was just wondering if this is normal?
By the by, I'm brand new to the site and so far, love it. Thanks.

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Old 07-11-2007, 10:03 PM   #2
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Quote:
Originally Posted by spearhunter_1 View Post
Anybody know what the estimated fuel mileage was on their fuel injected 4 cylinder YJ when it was new? What are ya'll getting for mileage now with your lift kits and larger than stock tires? My engine runs great, (as far as 4 cylinders go), and I have 31x10.50's. I've removed the spare tire and carrier and anything else I felt I could live without in an attempt to cut weight but still can't get much better than 11 miles per gallon. Was just wondering if this is normal?
By the by, I'm brand new to the site and so far, love it. Thanks.
Welcome to the site! What are you using for gas? Brand and rating. Some vehicles will only run well on 87, some do really well on 91. Some of the fuel additives can significantly improve mileage. Also, what gears are you running?

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Old 07-12-2007, 03:08 AM   #3
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if you're worried about fuel economy, maybe you should sell that Jeep and buy a honda. You're gonna kill yourself to get better mileage and it just isn't going to work. It's just a way of life, lifted jeeps with big tires get horrible gas mileage. I mean it basically has all the aerodynamics of a refrigerator box.
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Old 07-12-2007, 10:27 AM   #4
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I have a four banger with big tires and get about 15 mpg right now. I am in the process of stripping it down (for other reasons) and have since taken out the back seat, spare tire, and two rusted out Tuffy consoles, a small locking trunk, big dead speaker boxes and all stereo equipment. I think that I am getting better mileage now but won't know officially until I next fill up. But I have already gone farther on this tank than previous fillups and have a way to go per the gas gauge.

I will let you know the result.
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Old 07-12-2007, 04:02 PM   #5
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Hmmm... wouldn't say that I'm worried...and I certainly would never own a foreign car...just curious as to what others were getting, (mpg-wise), so I could judge my own Jeep's performance...kind of a control, if you will. To answer your question Grandpa, I generally fill up at Citgo or BP, and I almost always fill up with 93. Now that you mention it, I felt like it actually did run better on 87, but thought I was just imagining it...how could any engine run better on a lower octane fuel, was my thinking. The rear gears are 4.10:1 as far as I know. Thanks to everyone for the replies.
Another reason I was curious, I was considering a 3 inch suspension lift to complement my already installed 2.5 inch body lift and replacing the 31's with 33's. My only hesitation is because I'm afraid my fuel economy AND power will both fall through the floor.
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Old 07-12-2007, 04:23 PM   #6
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upgrade to a small block chevy. keep your foot out of it and it cant get much worse milage. thatll solve your power isusses.
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Old 01-14-2010, 11:05 PM   #7
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Have a '92 4 cyl, with 265 x 15 tires on HEAVY aftermarket rims. 17mpg hwy, 15mpg in town. Tried passenger tires (215 75) when it was newer. Smoother and quieter, but no real improvement in gas mileage - maybe 1/2 mpg better at best.
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Old 01-14-2010, 11:37 PM   #8
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I only get like 120 miles to a tank of gas....4 banger
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Old 01-15-2010, 07:58 AM   #9
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My 88 yj gets 17 mpg. Has standard size tires, 2 inch lift, 4 cyl, 5 spd. I am a another grandpa who is probably starting to drive like an ancient mariner. Seldom over 55 mph with a tail wind and strictly for pleasure.
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Old 01-15-2010, 08:39 AM   #10
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1994 4.0 SE Soft Top, No Lift, 30x9.5 BFG ATKO, 16-20MPG in mixed driving. It also depends on Winter versus Summer fuel. The change the blend around here in an effort to improve air quality, and the winter fuel gets slightly worse mileage. I always run the 87 Octane. When new, I sometimes used the premium, but I never noticed any improvement to performance or mileage, and having since learned more about octane and how fuel burns, for any stock jeep motor, the higher octane is just wasted money, and may actually hurt performance.
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Old 01-15-2010, 08:40 AM   #11
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Fuel Milage???? Whats that?? I have a 95 with a 2.5 and an auto. I get about 12 mpg out of it. But then again, the thing has the aerodynamics of a house and the same horsepower as a small hamster. I did the 20 gal conversion on it, and I can go about 250-265 miles on a tank.
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Old 01-15-2010, 11:04 AM   #12
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I have a stock '93 4 banger with a 5 speed and 31X10.5 tires. I get about 14 average city/hwy combo mileage.
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Old 01-15-2010, 10:08 PM   #13
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My 1991 YJ with 177K on the original 2.5 gets 15 mpgs and I also have a similar lift and 31's. If you are concerned now about your power and mpgs I wouldn't go much bigger. I used to have 32's and can tell the difference.
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Old 01-15-2010, 10:17 PM   #14
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94 2.5L 5 speed...31x10.50s, spare still on, backseat, plus stuff in the back. I don't honestly know exactly what I get, but if I drive very nicely I can get to a town that is 8 miles away and back with less than a 16th of a tank, according to the fuel guage. If I drive fun....I can drop a quarter doing the same run.
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Old 01-15-2010, 10:56 PM   #15
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I have a 90 2.5 liter with 4"lift and 33's I get around 17 mpg and thats with 220,000 on the engine.
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Old 01-16-2010, 01:18 AM   #16
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Mines a 89' 6 cyl 4.2 liter stock gears (3.07's I think) and 33's. According to the math from my odometer I get around 11mpg. then factor in the difference in actual miles driven... I like to think I get 13+

Odo says 150,000 but thats not accurate
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Old 01-16-2010, 04:37 PM   #17
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Im runnin 33's and got about 5 for the longest time. I eventually got so tired of it i went through and changed every fuel/oil/air filter and tossed in some synthetic oil and now i get about 15
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Old 01-18-2010, 04:54 PM   #18
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93 yj straight six. im gettin around 14mpg. runnin 35's. not to shaby for a fridge on wheels.
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Old 01-18-2010, 06:26 PM   #19
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95, 2.5 5spd,31's 13mpg .dosent even bother me .just like they call the shuttle a flying brick
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Old 01-25-2010, 08:39 PM   #20
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I've got 121,600 miles on a '94 4.0 litre w/ 5-SPD, running 31 x 10.50's & I consistently get 18.5 MPG, about 320 miles per tank. Now with the winter temps & having to warm it up, she's an outside cat, idling eats into the MPG.
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Old 01-25-2010, 08:51 PM   #21
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ive got a 94 4.0L with 5speed and 32" tires and i get 15mpg with a combo of city and highway.

whenever i just drive around town i get more like 12-13mpg

and then when i drove it from colorado to texas i got like 19-20 man i wish i got that all the time! haha
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Old 01-26-2010, 04:15 AM   #22
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So the 2.5l MPG is on highway same as 4.0l. Deam :S
At summer I get my 2.5 TBI following MPG:
Highway 60mph @ 20.5MPG
City: 15MPG

And now on winter(5 F) Highway/City 70/30
and 15MPG.
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Old 01-26-2010, 05:31 PM   #23
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1990 4cyl 5 speed. 3 inch body lift and the dreaded 2 " shackle lift. 31x10.50 bfg all terrains average is 16-17 mpg every tank
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Old 01-27-2010, 07:16 PM   #24
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i have a 93 4.0 manual with 180k doing 15 mpg on 31's and a 2.5 in lift
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Old 01-27-2010, 07:27 PM   #25
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95 4.0L auto 30" tires.. around town 14mpg.. highway.. not sure.
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Old 02-15-2012, 05:15 PM   #26
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my gets 7mpg haha, its got a auto trans and the i-6, but is allso got a bad trans, 2 bad o2 sensers, 33s, and the sleak body line of a brick fighting mashine.
o' and its my project so u know and i think i maybe done soon :}
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Old 02-15-2012, 05:39 PM   #27
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15 mpg on mine. 4 cyl.- 92- stick.
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Old 02-15-2012, 05:53 PM   #28
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I got a 2.5L 5 speed, and with the 4 inch rough country lift kit, and 33x10.5 BFG KM2s and get around maybe 14-17mpg. Which is considerably good.. Im not exact sure on the math but ill redo it soon.. the only reason why i say that is because with bigger tires.. im actually going farther than my odometer says.. after about 200 miles on 32x11.5s i was gettin a little over 13 BEFORE compensating for the bigger tires.. soo thats why i was saying between 14-17.. just to be safe.. and i think the km2s i have on now are actually better lol.. i feel like i have a little more power.. IMO, than 32x11.5s but anyway.. if ur that concerned about MPGs.. idk why ud have a jeep :/
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Old 02-16-2012, 07:49 AM   #29
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octane

The octane rating of a fuel is a measure of how hot it has to get before it will ignite. The higher the octane rating, the higher the ignition temperature.

An engine gets maximum performance when the fuel is just at the point of self igntion (due to compression - dieseling) and the spark plug just determines the precise time and reliability of ignition.

A high compression engine requires higher octane because the compression will reach ignition point prior to the spark plug firing. That is why it is call pre-ignition. It produces a severe knock as the fuel is ignited and turning to gas (expanding violently) while the piston is still on its up-stroke. Extremely damaging to the engine unless it is built for that, such as a diesel engine is. That is why the diesels have to have heavier blocks and stronger crank shafts and bearings.

The energy in a gallon of gas, whether premium, regular, 93 or 87 octane is almost identical. What we get out of it is determined by how efficiently it is compressed and ignited at the optimum time.

Engine control systems (computers) can now monitor pre-ignition and adjust the timing such that lower octane fuels can be run without having pre-ignition. This is a way that they optimize the engine and get maximum mileage. Retarding the spark lowers the cylinder temperature and inhibits pre-ignition.

Adding ethanol to the fuel is a travesty to say the least. There is significantly less energy in an ethanol/gas mixture. If you add 10% ethanol you get about 10% less mileage. However, the flash point (ignition temperature) of the ethanol is much lower. That is why the ethanol blend has a higher octane rating. This allows an engine running ethanol to have a significantly higher compression ratio without pre-ignition. This creates more power from that specific type of engine and is the reason some run ethanol in extreme high performance situations.

Using higher than required octane fuel in an engine is a total waste of money and actually decreases the performance and mileage. However, it is very desirable to the oil companies and fuel suppliers as the markup is greater.

Some add "octane boosters" to the fuel to stop pre-ignition. All those do is increase the flash point (ignition temperature) and reduce efficiency of the fuel. Some engines require this because there can be a build up in the cylinder and a small tip created. This tip can then reach (and retain) a higher temperature than the rest of the material. It acts as a "spark plug" and causes the fuel to ignite at a lower temperature than it would from dieseling only. This can cause pre-ignition. The cylinder has to be cleaned or a higher octane fuel used to correct the problem.
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Old 02-16-2012, 08:00 AM   #30
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I have a completely stock (well, the carpet is gone) '95 with a 2.5L and 5-speed that's my daily driver and I've been averaging around 16-17 mpg. And I do have a habit of driving it like I just stole it.

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