Horrible Fuel Milage

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by OTH T&L, Mar 21, 2020.

  1. OTH T&L

    OTH T&L Bobtail Member

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    Jun 6, 2019
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    2017 Volvo vnl760 with D13, automated, 540k. Getting 5mpg at 65 regardless of load weight. Just replaced fuel and air filters. What else should I try?
     
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  3. McMahons Trucking

    McMahons Trucking Light Load Member

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    Jul 4, 2018
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    How about the turbo? Is it smoking at all?
     
  4. OTH T&L

    OTH T&L Bobtail Member

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    Jun 6, 2019
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    Not that I have noticed. I do go through a fair amount of coolant. Have to put some in every other day or 2 tops.
     
  5. McMahons Trucking

    McMahons Trucking Light Load Member

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    Jul 4, 2018
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    Coolant usage may be tied to it. head gasket? Might need tondo a leakdown test.
     
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  6. turbobandit

    turbobandit Bobtail Member

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    Jan 19, 2018
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    Have somebody do a low power check. They should check for boost leaks, turbo adjustment, cutout test, etc.
    Be sure and tell them that you’re having to add coolant.
     
    PE_T Thanks this.
  7. Bakerman

    Bakerman Road Train Member

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    If you’re going through that much coolant, you’ve got a problem
     
    PE_T and daf105paccar Thank this.
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