389 X15 13 speed fuel mileage

Discussion in 'Peterbilt Forum' started by Md420, Nov 11, 2019.

  1. Md420

    Md420 Medium Load Member

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    What are you guys getting out of this combo and do the little air deflector/wings on the top of the mid roof actually help when pulling a van
     
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  3. Roberts450

    Roberts450 Road Train Member

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    What size tire, what gear ratio, which cummins X15, what area you running, how much weight and how big a gap between truck n trailer?
     
  4. Md420

    Md420 Medium Load Member

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    280 frame, will be east coast/south east, 565hp 2050tq, 3.36 rears, 295/75R 22.5.

    Say average weight of 33k in the box
     
  5. Roberts450

    Roberts450 Road Train Member

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    Upper 5’s Low 6’s if your lucky. That much of a gap Id skip the turbo wing.
     
    Last edited: Nov 11, 2019
  6. Md420

    Md420 Medium Load Member

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    If I were to back it down to about five to about 500hp would that help it
     
  7. Roberts450

    Roberts450 Road Train Member

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    Not really since its the performance series.
     
  8. Md420

    Md420 Medium Load Member

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  9. Milr72

    Milr72 Medium Load Member

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    The position of the right foot would make a difference.
     
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  10. AModelCat

    AModelCat Road Train Member

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    Price of being cool. Hood + 80k lbs + 15L engine will never equal fuel economy. Buy a Volvo if you're chasing fuel mileage lol.
     
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  11. Md420

    Md420 Medium Load Member

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    Still dont hurt to try to get the best I can
     
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