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JK lift versus mileage

Discussion in 'Quitters' Club' started by duffer, Aug 27, 2012.

  1. Aug 27, 2012
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
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    3,225
    What kind of mileage hits are 2 and 4 inch lifts making? I am most interested in a lift without a tire size increase and realize that may limit the "sample" base a bit. I am going to assume the 3.6 and 3.8's will suffer the same relative decrease.
     
  2. Aug 27, 2012
    WRMorrison

    WRMorrison Member

    Mesa, AZ
    Joined:
    Jul 28, 2012
    Messages:
    217
    If all you're doing is a 2-4" lift and changing NOTHING else, I doubt you'd see any real difference in mileage, but that's just me.

    -WRM
     
  3. Aug 31, 2012
    Hawkes

    Hawkes Member

    Nova scotia
    Joined:
    Jun 18, 2003
    Messages:
    490
    I agree, surface area to the wind doesn't really change. Worst that can happen is you go from bad to worse. ;)
     
  4. Sep 14, 2012
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2021 Sponsor 2020 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
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    7,959
    I suspect the increased driveshaft angle may eat some HPs, especially on a 4" lift, although maybe not enough to notice.
     
  5. Oct 1, 2012
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    11,876
    I disagree. Lifting a vehicle increases the "dirty air" under the vehicle increasing drag. May not be much, 1-2 mpg if that, but it will change some as its basic airflow characteristics to all vehicles.
    Unfortunately I can't help with this specific vehicle.


    Sent from my iPhone
     
  6. Oct 23, 2012
    scemracing

    scemracing New Member

    Joined:
    Oct 21, 2012
    Messages:
    1
    I didn't lose much on my JK with a 2.5" lift the thing that killed me was the tires I am running a 37 now and I am getting 15ish in the city with a 2012 3.6.
     
  7. Oct 24, 2012
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
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    3,225
    That was exactly my concern. Not the rotating mass of bigger wheels and tires which I can guess pretty well what the results will be. I think it is going to get the mild 2" Mopar (REx?) lift if the dealer will put it in writing that he will still honor the warranty. They said it verbally but I am sure that wouldn't hold much water if I actually needed some work done.
     
  8. Oct 24, 2012
    Dummy

    Dummy I kick hippies

    Escondido, CA
    Joined:
    Dec 5, 2004
    Messages:
    646
    ^^^^^This. Nick is right. You'll see a small degredation in MPG even with a leveling kit. That's why OE vechicles are raked down from the factory - to better cut the air like a knife and to minimize dirty air that's able to get under the front of the vehicle and cause drag on the undercarriage.

    http://www.jpmagazine.com/projectbuild/154_0805_2007_jeep_wrangler_rubicon_two_door/viewall.html
    check what ^^^ says around mile 16,500

    http://www.jpmagazine.com/projectbuild/154_0911_55k_mile_jeep_wrangler_jk_rubicon/viewall.html
    ^^^more suspension/tire and wheel mpg talk

    http://www.jpmagazine.com/techarticles/engine/154_1210_7_steps_to_power_and_milage/
    ^^^power parts and MPG on 3.8L JK
     
  9. Oct 24, 2012
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
    Messages:
    3,225
    Thanks Christian,

    Sort of remember reading some of that but didn't have any plans of buying a new Wrangler at the time so didn't pay too much attention to it.

    Good to see you still have a little time to visit the site












    and I approve the direction you are going with JP.
     

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