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2017 3500 Heavy Duty poor fuel mileage

Discussion in 'Engine and Performance' started by Rsuarez, Sep 10, 2020.

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  1. Rsuarez

    Rsuarez Junior Member

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    Hello everyone,

    I'm new to the group. I recently purchased a 2017 Ram 3500 Heavy Duty, automatic, crew cab, 8ft bed,srw, 4x4 with the 6.7 Cummins. I mostly use it to tow my boat. So during the week it's always running empty. My fuel mileage is around 10.5 to 11.3. When I tow the boat it drop very little to around 8.9 to 9.2 the boat with trailer is around 10k.

    I'm in Florida so there are no hills or mountains or winter fuel issuses.

    Is this the normal fuel mileage? Also the truck only has 75k miles on it.

    Thank for the help.
     
    Last edited: Sep 10, 2020
  2. WY-Dave

    WY-Dave Senior Member Military

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    I's say something is wrong to start with. My '18 2500 auto, CC, 6ft, 4x4 6.7CTD daily driver gets mpgs in the 16s. This is with rolling hills and more than not headwinds. It has 3.42 gears.
    BTW Title says 3500 but in the post you say 2500
     
  3. Rsuarez

    Rsuarez Junior Member

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    Thanks I just changed to 3500. My old one was a 2500. Just still used to say 2500.
     
  4. OrganizedChaos

    OrganizedChaos Junior Member

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    Just got my 2017 3500 with CTD and have put about 400 miles on it. Evic shows 18.1 average over those miles. Have bigger tires and 70 on the speedo is actually 75 so thinking the evic might be close.

    Sent from my Pixel 3 XL using Tapatalk
     
  5. Rsuarez

    Rsuarez Junior Member

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    My shows 10.2 as of today. With only having put about 1000 miles on since I got it. About 3 weeks ago.
     
  6. BubbaJo

    BubbaJo Member

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    what gears are you running? when was the last time you changed your fuel filter? Have you tried filling up at a different station?

    I have noticed in my small town, that fuel mileage will go up and down depending on what station i buy it from. Heck one station would even throw a SEL code on me when i got to around 1/2 tank. Stopped going there and saw my mileage go up a little and haven't had a light since.
     
  7. Rsuarez

    Rsuarez Junior Member

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    Have 3.73 gears. Only have had the truck about 3 weeks but yes have used different fuel stations. Milage has stayed the same.

    When pulling the boat we travel about 300 miles each way. Gets down to about 9 - 9.5 with about 10k. This week has only gone upto 10.5 not hauling anything.
     
  8. MADDOG

    MADDOG Cummins Driver Administrator Supporting Member Military

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    Something is wrong with the fuel system. I suspect it may be the fuel filters.

    I looked at your engine designation on your profile and have a question.

    What is a "Cummings" ?
     
    BubbaJo likes this.
  9. BubbaJo

    BubbaJo Member

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    i forgot to ask that. When was the last time your fuel filter was changed? Air filter? what type of tires are you running? aggressive tread? are they pumped up all the way? (mine requires 70psi)
     

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