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Thread: TERRIBLE Gas mileage in my 2.5L (TJ)

  1. #1
    Junior Member gunnersmac's Avatar
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    Unhappy TERRIBLE Gas mileage in my 2.5L (TJ)

    Well, bought this TJ on Friday... filled it up the same day. Today (Monday) coming home I'm on 1/4 tank, and the trip says 100.6 WTF??? Stopped at the auto parts store tonight, picked up new plugs and plug wires. I'll get a new cap and rotor soon too... I can't believe how bad it is... Ugh.

    What should my next steps be after all this? I checked the air filter, fluid levels, etc. all on the first day... haven't checked tire pressure yet, but 6.3 mpg???

    '97 TJ
    "Jessica"

    Second time Jeep Owner
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  2. #2
    Administrator korisu56's Avatar
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    That doesn't sound right for a stock rig. Ask 05Warrior about what he's got going on in his 4banger. He was getting pretty good gas mileage (more than you) on 35's w/ 4.88's locked.

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    Administrator miljeep's Avatar
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    Have you tried to fill it up again to see if 3/4 of a tank was actually used? The gauge may be busted. It could be a simple fix. I don't know what size tank you have, but to make it easy, I'll say a 16 gallon tank, 1/4 left means that you burned 12 gallons for 100 miles making it about 8 miles a gallon. Damn man, here....

  4. #4
    Buy My Bike! 05warrior's Avatar
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    I get around 160 miles on 10 or 11 gallons with my 4 banger. The best thing to do is go easy on the skinny pedal

  5. #5
    Time n Money Ghost00TJ's Avatar
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    2.5l engins are overworked to begin with. like he said drive moderatly and keep it tuned up will help. Any tire bigger than stock will drop the mileage quick.

    And remember its a JEEP not a Prius.....not known for MPG just going anywhere you want and having fun.

    Whats normal for a 4cyl? 15-16MPG
    My 4.0l was getting 15.5-17mpg with 30's now I run 33x12.50 and get about 12.5mpg.
    F'it, aint my Jeep!
    Beer does a Jeep Good

  6. #6
    Junior Member cknx77's Avatar
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    Ouch! Should be doing better than that! Got a gas leak somewhere? Watch out for siphoners too in some areas...May want a locking cap! The higher gas prices go, the more desperate people there will be with a siphon hose!

  7. #7
    Junior Member Carl's Avatar
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    I've got a 95 2.5 with 4:56 gears and 33" tires. I get about 190 miles per tank or about 12 miles per gallon, not the best but the fun out weights the mileage.
    2012 Jeep JK Sport, 3" Zone Suspension Lift, 305-70-R17 Nitto Terra Grappler AT tires, 17x9 Ballistic Wheels

  8. #8
    Junior Member gunnersmac's Avatar
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    Thanks for the input/info everyone... changing plugs, wires, cap, and rotor today. Hope that helps. Will probably switch to my locking gas cap too. I'm only running 31x10.50's on it, shouldn't be hurting it that much. I will have to look up what size the tank is too, not sure ATM. It seems quite slow too, whats the normal top end for my style set up? I don't expect a rocket, trust me I know what I got myself into here, but it just seems a little slow(er) than most.

    '97 TJ
    "Jessica"

    Second time Jeep Owner
    First time 4x4 Owner
    U.S. Coast Guard - Active
    http://www.dadsofgaming.com
    An adult gaming community.

  9. #9
    Administrator korisu56's Avatar
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    I dunno how viable an option this is for you, but my buddy once carried a little gas can with him and ran his gas tank from fillup to empty to check his mileage. That would let you know about your sending unit, give you a picture of accurate mileage depending on your gas tank size, and let you know how many miles till empty. That way at least you know how far you could go.

  10. #10
    Buy My Bike! 05warrior's Avatar
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    also, if you haven't corrected your spedometer gear since going to a bigger tire your speed and distance will be off. That won't solve all of your problems but at least you'll know more accurately your gas mileage.

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