Fuel mileage

Discussion in 'Peterbilt Forum' started by Iyaoyas45, May 28, 2022.

  1. Iyaoyas45

    Iyaoyas45 Bobtail Member

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    Jan 3, 2020
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    2021 389 long hood, 78″ stand up, X15 565 Cummins, 2050# torque, 18 speed, 280″ wheelbase, front airide, all disc brakes.

    If I make this a "off-road" truck and
    "If" I deleted this truck, what fuel mileage should I get. Not looking for exact numbers, I understand that there are many different factors. Just trying to get a idea what I will get. Let's say that I haul seed and a cattle pot but obviously never on a state/federal road since it's deleted.
     
    Bean Jr. Thanks this.
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  3. Banker

    Banker Road Train Member

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    A herd bumper, 389 and a cattle pot don’t add up to good fuel mileage. Very Nice looking ride but my bet is that if you see 5 mpg loaded you likely will be be happy. Speed is about the only thing going to help you and that won’t help live cargo. I have a dirty motor in a slightly less aerodynamic ride pulling completely non aerodynamic freight averaging 4.8-5. I am good with it even at $5.50 fuel.
     
    Bean Jr. Thanks this.
  4. Iyaoyas45

    Iyaoyas45 Bobtail Member

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    Jan 3, 2020
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    I average between 4-4.5 mpg. Was hoping that doing a full delete and egr removal would get me better than that
     
  5. AModelCat

    AModelCat Road Train Member

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    Canuckistan
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    It'll keep you out of the shop at least.
     
  6. Banker

    Banker Road Train Member

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    I can’t swear to any real fuel savings that are large enough to document but things I have done that may help slightly. I don’t know about a delete as my rig is a glider.
    1. Fleet Air Filters. I like them whether or not they actually help with fuel mileage.
    2. FASS fuel system, Air Dog or something similar. It does smooth the engine at idle and supposedly helps mileage slightly. I have a FASS and have since the truck was brand new.
    3. While it is not likely your charge air cooler is leaking, being this new. Mine was and cost me .5 mpg. You can buy or build a test kit and check yours yourself if you like.
    4. Make certain your fan isn’t running all the time or too often, this also cost me .5 mpg when I had a switch go bad and the fan ran constantly.
    5. Slowing down will without a doubt save you .1 mpg per mile per hour. This is proven by multiple sources way more knowledgeable than me. I have places to go and loads to haul so I run a happy median 65-70 something.
    6. Some tires have terrible rolling resistance costing you fuel mileage. You can use a rolling resistance chart. Americamovesbytruck.com
    is just one you can use. Michelin has one on their site also to compare tires rolling resistance.
     
    Last edited: May 28, 2022
    ODR and Bean Jr. Thank this.
  7. Rubber duck kw

    Rubber duck kw Road Train Member

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    Pulling a pot is never a great fuel mileage proposition. Honestly doubt you gain more than .5 to maybe 1 mpg if you went to an aero truck over a 389. I would say "fixing" the exhaust system won't gain you much fuel mileage, probably keep you out of the shop though.
     
  8. wore out

    wore out Numbered Classic

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    CHASIN THE DEVIL'S HERD
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    I don’t know anyone that gets above 4.5 pulling a pot. I run the Midwest Kansas, Nebraska Texas etc. What little I go East my ol CAT does a lot better so it would stand to reason any would
     
  9. Coolbreezin

    Coolbreezin Light Load Member

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    I have a '91 379 EXHD with a 14.7L 893ci 3406b. Bobtail I touch 6mpg, maybe. Loaded Im in the low 5's until I hit 70mph. Then its all downhill from there. Im local so the mpg doesnt concern me, but the fuel costs are killing me.
     
  10. Concorde

    Concorde Road Train Member

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    West Melbourne Florida
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    If nothing else, you’ll save a small fortune on DEF.
     
  11. wore out

    wore out Numbered Classic

    13,081
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    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
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    What most wont ever get is the key phrase cattle pot. Nothing is fuel efficient in front of one of them. They are a parachute pull as hard empty as loaded just about. In the Midwest Kansas, Nebraska I will get 4.5 to 4.8. Going east to Florida, Virginia, Alabama I’ll get 5.5 and better. 3406B 18913B 3.55’s and 11R24.5 rubber. In an extended hood Pete. 85 gross most of the time. Hills and weight are easier than wind
     
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