Mpg on peterbilt 579 Cummins x15

Discussion in 'Ask An Owner Operator' started by Juanf94, Jan 24, 2023.

  1. Juanf94

    Juanf94 Bobtail Member

    Jan 24, 2023
    What mpg are you guys getting on a 2020 peterbilt 579 Cummins x15 loaded 70k+ lbs looking into buying one thank you
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  3. Concorde

    Concorde Road Train Member

    Jun 29, 2016
    West Melbourne Florida
    Asking another driver their true mpg is like asking a woman her weight.

    True mpg means ifta quarterly filing..not “on my dashboard it says 12 mpg going downhill”
    Juanf94 and Siinman Thank this.
  4. AgPilot1

    AgPilot1 Light Load Member

    May 29, 2022
    Way too many factors. I’ve seen 9.4 empty and I’ve seen 7 empty. I’ve done 7.5 at gross with tarps, flat road and plenty of time. I’ve also done 4.8 with 25k on through the mountains and running 85.
    Juanf94 and Siinman Thank this.
  5. KrumpledTed

    KrumpledTed Light Load Member

    May 6, 2022
    I know a guy with a 21 579 500 horse X15 Efficiency series, 13 speed with 3.25 rears on low pro 22.5. Standup bunk 250” WB pulls hopper and loaded to gross about 75% of all miles. He got 6.4 mpg this last quarter. 6.7-6.9 during the warmer quarters with the better fuel blends.

    Specs and what you’re doing, not just the weight, have an impact. These newer fuel sipper spec trucks might get 8 or 9 mpg pulling relatively light loads in a van with the trailer #### near slammed into the sleeper and you stay below 60 mph. Same truck pulling 48k of tarped sheetrock where the load is 4 feet or more back from the front of the trailer will only get 6 and that’s if the wind is behind it.
    Juanf94 Thanks this.
  6. Long FLD

    Long FLD Road Train Member

    Mar 4, 2015
    2022 579. 510 Paccar with 12 spd trans and 2.79 rears. Currently at 7.37mpg lifetime on paper, tracking every tank of fuel. I have a little bigger sleeper gap than most and I see a drop in economy with winter blend fuel.

    If you ask someone their mileage and they can’t give you one single number then take it with a grain of salt because they’re not really tracking their fuel tank to tank to get a weekly, 4 week, and lifetime averages. IFTA filings will get you close but they can be fudged unless you start the quarter with a full tank and end the quarter with a full tank.
    Siinman Thanks this.
  7. Siinman

    Siinman Road Train Member

    Mar 5, 2017
    Kansas City, MO.
    Life time on my Volvo so far is 7.73 so far. Been going down since winter started last 30 is 7.10 and last 60 is 7.5.
  8. Juanf94

    Juanf94 Bobtail Member

    Jan 24, 2023
    Thanks to all your replies i would mostly be running dryvan local work in Northern California
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