Cummins isx fuel average becoming worse overtime

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

  1. Gurjap

    Gurjap Light Load Member

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    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?
     
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  3. Allow Me.

    Allow Me. Trucker Forum STAFF Staff Member

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    May 28, 2009
    Rancho Mirage, Ca.
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    What was the fuel mileage 3 months ago and what is it now. Running into a headwind, excessive idling, Maybe do some filter maintenence
     
    Diesel Dave Thanks this.
  4. ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    Apr 25, 2021
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    We're starting Winter blend fuels right now so your MPG will drop for a few months at least.
     
    Gliding ProStar Thanks this.
  5. RunningAces

    RunningAces Heavy Load Member

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    Jul 2, 2017
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    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?
     
    singlescrewshaker Thanks this.
  6. runningman0661

    runningman0661 Road Train Member

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    Mar 5, 2009
    Clover, South Carolina
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    When is the last time you had the overhead set? Checked for boost leaks via a pressure test?
     
    Geekonthestreet Thanks this.
  7. mitmaks

    mitmaks Road Train Member

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    May 16, 2014
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    Imap sensor clean or replace/ air filter/ fuel filters
     
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