ISX 5.3 mpg is it normal??

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Duliz, Jun 20, 2008.

  1. Carolina Slim

    Carolina Slim Bobtail Member

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    Jan 8, 2017
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    Thats what i think there has to be something wrong but idk what im in no way a mechanic or very mechanical so im not sure where to start or what to look for for this as far as the oil sample i have not done that but new actuators were put in about 30,000 miles ago
     
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  3. Mrdano13

    Mrdano13 Bobtail Member

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    Mar 19, 2019
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  4. Mrdano13

    Mrdano13 Bobtail Member

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    Mar 19, 2019
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    That's incorrect, the cm870s (this model isx) runs higher rpms. You can't run them low like a cat or your just gonna lug them down the road and lose more mpgs. I had a 2004 isx in a Volvo and a 2007 isx in a w900l, both 13 speed and both 3.55 rears and both run same rpm at 65 sits around 15. Fyi same exact engine they didn't change until later when they added regeneration.
     
    cjb logistics Thanks this.
  5. Jmack29115

    Jmack29115 Bobtail Member

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    Nov 22, 2019
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    where did you go to get the delete?
     
  6. BJSingh_TruckersReport

    BJSingh_TruckersReport Bobtail Member

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    Jul 18, 2021
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    I have a 2013 Pete 365, ISX 11.9, 3.90 rears...also getting about 5.4 mpg...any good input welcome!
     
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