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2017 579 epiq 400hp isx15 10sp mpg

Discussion in 'Peterbilt Forum' started by Vogeypohl, Mar 10, 2022.

  1. Mar 10, 2022 #1
    Vogeypohl

    Vogeypohl Bobtail Member

    9
    3
    Feb 27, 2022
    0
    What kind of MPG should I be getting with my Pete ? I don't drive over 70 I usually Set the cruise at 66 but the best ive seen is 6.6 mpg usually mode like 6
     
    Vogeypohl, Mar 10, 2022
    Vogeypohl, Mar 10, 2022
    #1
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  3. Mar 12, 2022 #2
    Vogeypohl

    Vogeypohl Bobtail Member

    9
    3
    Feb 27, 2022
    0
    Overnight couple days ago I dropped from 6.2 to 5 miles per gallon even empty I can't get over 5 I'm trucks running fine there's no codes. How much def should I be going through? I go through half a tank of def every tank of fuel
     
    Vogeypohl, Mar 12, 2022
    Vogeypohl, Mar 12, 2022
    #2
  4. Mar 12, 2022 #3
    Crude Truckin'

    Crude Truckin' Alien Spacecraft

    2,405
    6,645
    Oct 22, 2016
    North Dakota, Eh?
    0
    What you pulling? Where you running? You idle overnight? Lots of variables. Details.
     
    Crude Truckin', Mar 12, 2022
    Crude Truckin', Mar 12, 2022
    #3
    GYPSY65 Thanks this.
  5. Mar 12, 2022 #4
    Vogeypohl

    Vogeypohl Bobtail Member

    9
    3
    Feb 27, 2022
    0
    Pulling 53' dry van usually 70k or so no ldling mostly mid west though the best mpg i got was wi to NC also the first run at 6.7 then it slowly started dropping from there till the other day it dropped to 5 running flat ground even empty
     
    Vogeypohl, Mar 12, 2022
    Vogeypohl, Mar 12, 2022
    #4
  7. Mar 12, 2022 #5
    Crude Truckin'

    Crude Truckin' Alien Spacecraft

    2,405
    6,645
    Oct 22, 2016
    North Dakota, Eh?
    0
    I'd have the shop hook up and see what the health of the after treatment system is.
     
    Crude Truckin', Mar 12, 2022
    Crude Truckin', Mar 12, 2022
    #5
    jsnell Thanks this.
  8. Mar 12, 2022 #6
    GYPSY65

    GYPSY65 Road Train Member

    1,957
    5,263
    Nov 16, 2012
    SW FLA
    0
    How long have you had the truck?
    I don’t have the same set up, have a Ultraloft Paccar 510hp that I actually just sold but pull a Conestoga which is like pulling a kite and I run faster 68-73 and still did in the mid 7’s
    Drop my speed and it would push into the 8’s

    If you just got it. Winter fuel will be part of the equation but your numbers with that small HP should be better
     
    GYPSY65, Mar 12, 2022
    GYPSY65, Mar 12, 2022
    #6
    Oxbow Thanks this.
  9. Mar 22, 2022 #7
    Long FLD

    Long FLD Road Train Member

    12,055
    49,746
    Mar 4, 2015
    0
    Are you figuring your mpg on paper when you top the tanks completely off or are you just going by the dash display?

    What’s the condition of your air filter?

    Have you tested your charge air cooler for leaks?

    How long have you had the truck? If you’ve been in the Midwest lately it’s been windy and cold, both of which can take fuel economy down quickly.
     
    Long FLD, Mar 22, 2022
    Long FLD, Mar 22, 2022
    #7
    Big Road Skateboard and Oxbow Thank this.
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