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cumminsx 15 450 hp with eaton 10 speed overdrive and 3.36 rears

Discussion in 'Peterbilt Forum' started by kay_ray, Aug 25, 2019.

  1. Aug 25, 2019 #1
    kay_ray

    kay_ray Medium Load Member

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    hey guys i am looking at a 2016 579 with cummins isx 15 450 hp with 10 speed eaton smart advantage overdrive with 3.36 rears. i know its a bad combination if i want to run close to 70 but will it give good mpg at 62-65?
     
    kay_ray, Aug 25, 2019
    kay_ray, Aug 25, 2019
    #1
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  3. Aug 25, 2019 #2
    tnevin225

    tnevin225 Road Train Member

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    Hi Kay-ray, I have that setup but with a manual so I can't speak about the auto but to answer your question in general you will see your best fuel mileage at around 62-65. And the faster you go over 65 it starts to drop off. I won't give you my fuel mileage because I have a lot of things done to my truck but in general you should get mid sevens driving it rite. Where are you mostly going to be running?
     
    tnevin225, Aug 25, 2019
    tnevin225, Aug 25, 2019
    #2
  4. Aug 25, 2019 #3
    kay_ray

    kay_ray Medium Load Member

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    mostly midwest but will occasionally climb the hills and eastern states. i was thinking about putting or getting truck with 3.08 rears that will prob give me speed around 70 keeping the fuel milage at around 7-7.5 and with 295 75 r 22.5 in the back and 275 80 r 22.5 on the steer.
     
    kay_ray, Aug 25, 2019
    kay_ray, Aug 25, 2019
    #3
  5. Aug 25, 2019 #4
    tnevin225

    tnevin225 Road Train Member

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    Might want to keep looking, there are thousands of trucks on the market. Just don't get in a hurry and find one that fits your needs. Good luck
     
    tnevin225, Aug 25, 2019
    tnevin225, Aug 25, 2019
    #4
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