1. #1
    Thatsthespirit's Avatar
    Thatsthespirit is offline Junior Member
    Join Date
    Sep 2019
    Location
    Indiana
    Posts
    12

    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.

    Sent from my Pixel 3 using Jeepz.com mobile app

  2. #2
    JPNinPA's Avatar
    JPNinPA is offline Senior Member
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    4,840

    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

    Sent using TapTalk
    Last edited by JPNinPA; 09-14-2019 at 07:30 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

Similar Threads

  1. 2001 grand Cherokee 2000 Jeep Cherokee
    By john_x_ in forum Cherokee, Commander, Wagoneer and Liberty
    Replies: 1
    Last Post: 07-07-2018, 09:32 PM
  2. 2000 Grand Cherokee
    By 00Jeep in forum Cherokee, Commander, Wagoneer and Liberty
    Replies: 8
    Last Post: 06-19-2016, 09:20 AM
  3. Grand Cherokee Limited 2000
    By bharrell in forum Cherokee, Commander, Wagoneer and Liberty
    Replies: 1
    Last Post: 10-03-2009, 12:41 AM
  4. 2000 Grand Cherokee Oil Leak
    By cundifc in forum Cherokee, Commander, Wagoneer and Liberty
    Replies: 3
    Last Post: 09-07-2009, 09:43 PM
  5. Grand Cherokee WJ 2000
    By petemilner@aol.com in forum Cherokee, Commander, Wagoneer and Liberty
    Replies: 0
    Last Post: 07-11-2008, 10:21 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Log in

Log in