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Sudden drop in MPGs

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Cohiba, Jan 9, 2022.

  1. Jan 9, 2022 #1
    Cohiba

    Cohiba Bobtail Member

    40
    34
    Mar 27, 2018
    0
    Let the truck idle a week ago overnight at 1000rpms. Added Howes diesel treat. Since that night I've been getting less than 6 mpgs. I was consistently getting 6.7 to 7. I run the same route everyday and loads are generally same weight everday. What gives?
    2005 isx550
     
    Cohiba, Jan 9, 2022
    Cohiba, Jan 9, 2022
    #1
    Old Man Thanks this.
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  3. Jan 10, 2022 #2
    Magoo1968

    Magoo1968 Road Train Member

    2,055
    5,475
    Mar 18, 2021
    St Malo mb
    0
    Cold drops fuel mileage. Also if you don’t use fuel treatment at all but added it once sometimes it will plug fuel filter with junk . If you’re filters are close to change interval you can try changing filter .
     
    Magoo1968, Jan 10, 2022
    Magoo1968, Jan 10, 2022
    #2
    Cohiba Thanks this.
  4. Jan 11, 2022 #3
    noworrez

    noworrez Light Load Member

    97
    142
    Aug 6, 2020
    0
    And/or crappy fuel. This happens to me more in the winter than summer because of the cold and the winter blend being used.

    I usually run same about 6.7 to 7 but have dropped to 5.6 from crap fuel.
     
    noworrez, Jan 11, 2022
    noworrez, Jan 11, 2022
    #3
    Cohiba Thanks this.
  5. Jan 11, 2022 #4
    Cohiba

    Cohiba Bobtail Member

    40
    34
    Mar 27, 2018
    0
    Changed the fuel filters.....got 6 yesterday. I'll just go with cold and crappy fuel. Who has good winter fuel? T/A was clogging filters in less than 5,000 miles. Started going to Love's and was fine til two weeks ago
     
    Cohiba, Jan 11, 2022
    Cohiba, Jan 11, 2022
    #4
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