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389 X15 13 speed fuel mileage

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

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  1. 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
     
    Md420, Nov 11, 2019
    Md420, Nov 11, 2019
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  3. Nov 11, 2019 #2
    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?
     
    Roberts450, Nov 11, 2019
    Roberts450, Nov 11, 2019
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  4. Nov 11, 2019 #3
    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
     
    Md420, Nov 11, 2019
    Md420, Nov 11, 2019
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  5. Nov 11, 2019 #4
    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
    Roberts450, Nov 11, 2019
    Roberts450, Nov 11, 2019
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  7. Nov 11, 2019 #5
    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
     
    Md420, Nov 11, 2019
    Md420, Nov 11, 2019
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  8. Nov 11, 2019 #6
    Roberts450

    Roberts450 Road Train Member

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    Not really since its the performance series.
     
    Roberts450, Nov 11, 2019
    Roberts450, Nov 11, 2019
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  9. Nov 11, 2019 #7
    Md420

    Md420 Medium Load Member

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    Well ####.
     
    Md420, Nov 11, 2019
    Md420, Nov 11, 2019
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  10. Nov 11, 2019 #8
    Milr72

    Milr72 Medium Load Member

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    The position of the right foot would make a difference.
     
    Milr72, Nov 11, 2019
    Milr72, Nov 11, 2019
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  11. Nov 11, 2019 #9
    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.
     
    AModelCat, Nov 11, 2019
    AModelCat, Nov 11, 2019
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  12. Nov 11, 2019 #10
    Md420

    Md420 Medium Load Member

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    Still dont hurt to try to get the best I can
     
    Md420, Nov 11, 2019
    Md420, Nov 11, 2019
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    AModelCat Thanks this.
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