1. #1

    I have a 2000 Grand Cherokee 4.0 n I'm looking for better gas miliage

    I have a 2000 Grand Cherokee 4.0 n I'm looking for better gas mileage. I'm not a mechanic by any means so my knowledge is limited. I thought of changing the plugs, maybe a cold air intake but the milage is hurting after my previous 30mpg ride. Any advice is much appreciated.

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  2. #2
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    5,387

    I have a 2000 Grand Cherokee 4.0 n I'm looking for better gas miliage

    What mpg are you getting?

    There is little to be done to improve mpg. 16&18 mpg city & highway new.

    Cold air intakes get relearned by the PCM and you get about 500 mi of 1more mpg then it goes back.

    However there are things to get you back to normal.
    Proper speedo gear for the tire size and rear gears.
    Plugs, clean injectors, check fuel pressure, clean intake, TB and IAC, clean valves and combustion chamber (steam or sea foam) clean battery cables and opposite ground ends. Load test battery. Validate alternator output to loads specifically extra non stock loads (amps radios lights...)
    Check for codes. O2 sensors or bad cats rob mpg.


    Bigger wider tires kill mpg-increased rolling resistance. Lift kits kill mpg- pushing a bigger brick through the air.
    External lights add wing resistance.
    Same with roof racks.
    Lighten loads - heavy bumpers, spare tire, tools trunk stuff... Loose weight.
    Proper tire pressure reduces rolling resistance.

    Lay off the skinny pedal, slow to PULL OUT, brake easy...

    Highway at 65mpg actually gets the best mpg.

    Regards,
    JPNinPA

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    Last edited by JPNinPA; 09-14-2019 at 08:30 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3
    Join Date
    Nov 2019
    Location
    Mississauga, ON
    Posts
    18

    Re: I have a 2000 Grand Cherokee 4.0 n I'm looking for better gas miliage

    I get 19mpg on average, which is much more than I expected (2020 JGC V6). I drive 70% highway, the rest city, usually 60-70mph on the highway, and don't have a heavy foot. The sticker on the JGC says 19mpg in the city, I get that on average gas tank with mixed driving, which the sticker claims should get 21mpg. I don't get 21mpg even on pure highway driving unless it's straight and 60mph exactly for a long period, then I get about 23mpg, which is still less than the claimed 24mpg highway that the sticker claims.

    And I do use ESS.

    I gave up trying, I just drive without looking at that damned addictive gauge with the green showing me when I'm under average, argh, that this is hard to turn off, but now it's only on when wife drives me around (she's learning to drive) that way she sees if she's driving properly, and she wants to save gas too lol, or the Jeep, I think.

    EDIT: Sorry, I misread, thought you had a 2020, not 2000, and was about to ask what kind of 4.0 is that in a 2020. Seems to me that's great mileage for a 2000 big 6, as it's just a bit worse than a brand new Pentastar.

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