389 X15 13 speed fuel mileage

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

  1. AModelCat

    AModelCat Road Train Member

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    You're not wrong. Every bit helps.
     
    Roberts450 Thanks this.
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  3. spsauerland

    spsauerland Road Train Member

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  4. JonJon78

    JonJon78 Road Train Member

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    I've got this set up except 3.25 rear and I'm at 6.7 pulling a flatbed. I run the speed limit. You dont buy a 389 with fuel mileage as a concern LOL.

    I'm certainly happy to be getting 6.7. I dont idle as I have APU. But I dont think having the APU is really saving much fuel. Probably burns as much as if I were to idle.
     
  5. Md420

    Md420 Medium Load Member

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    Yeah I know you don't buy a hood for mileage but regardless of whatever truck a man is in they might as well try to get the best that they can you know what I mean
     
    stillwurkin and Roberts450 Thank this.
  6. JonJon78

    JonJon78 Road Train Member

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    I hear ya. I would still stick with the 565 over the 500.
     
  7. stillwurkin

    stillwurkin Road Train Member

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    My friend drives a 2018 or 19 KW 680. X15, 18 sp ,don't know the rear ratio. Has apprx 160,000 miles on it by now. He can hardly average 5.5 mpg.
     
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