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Cummins isx fuel average becoming worse overtime

Discussion in 'Experienced Truckers' Advice' started by Gurjap, Sep 24, 2022.

  1. Sep 24, 2022 #1
    Gurjap

    Gurjap Light Load Member

    55
    11
    Mar 18, 2020
    0
    Hello friends,

    I have a kenworth with a Cummins isx. Absolutely nothing is wrong with it. No abnormal smoke. But the fuel average is getting worse overtime. What could be the problem?
     
    Gurjap, Sep 24, 2022
    Gurjap, Sep 24, 2022
    #1
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  3. Sep 24, 2022 #2
    Allow Me.

    Allow Me. Trucker Forum STAFF Staff Member

    10,367
    11,207
    May 28, 2009
    Rancho Mirage, Ca.
    0
    What was the fuel mileage 3 months ago and what is it now. Running into a headwind, excessive idling, Maybe do some filter maintenence
     
    Allow Me., Sep 24, 2022
    Allow Me., Sep 24, 2022
    #2
    Diesel Dave Thanks this.
  4. Sep 24, 2022 #3
    ProfessionalNoticer

    ProfessionalNoticer Road Train Member

    2,941
    7,844
    Apr 25, 2021
    0
    We're starting Winter blend fuels right now so your MPG will drop for a few months at least.
     
    ProfessionalNoticer, Sep 24, 2022
    ProfessionalNoticer, Sep 24, 2022
    #3
    Gliding ProStar Thanks this.
  5. Sep 24, 2022 #4
    RunningAces

    RunningAces Road Train Member

    1,177
    2,380
    Jul 2, 2017
    0
    I have a 2017 t680 midroof with an isx15 cm2350 425hp 2.64 gears with a 10 speed autoshift. I haul flatbed and normally cruise at 68mph. Anyways, my average mpg is about 6.9. What's yours?
     
    RunningAces, Sep 24, 2022
    RunningAces, Sep 24, 2022
    #4
    singlescrewshaker Thanks this.
  7. Sep 24, 2022 #5
    runningman0661

    runningman0661 Road Train Member

    4,805
    13,123
    Mar 5, 2009
    Clover, South Carolina
    0
    When is the last time you had the overhead set? Checked for boost leaks via a pressure test?
     
    runningman0661, Sep 24, 2022
    runningman0661, Sep 24, 2022
    #5
    Geekonthestreet Thanks this.
  8. Sep 25, 2022 #6
    mitmaks

    mitmaks Road Train Member

    2,450
    1,952
    May 16, 2014
    0
    Imap sensor clean or replace/ air filter/ fuel filters
     
    mitmaks, Sep 25, 2022
    mitmaks, Sep 25, 2022
    #6
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