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6.4 on 37s, how's the power?

Discussion in 'Heavy Duty' started by Dmopar74, Dec 26, 2016.

  1. RAM_Designs

    RAM_Designs Senior Member

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    With majority highway miles, evic will show 13mpg (70-75mph). Towing a 2500# trailer with 6000# of batteries, I was getting 11mpg on the evic (70mph).
     
  2. Snake_Eyes

    Snake_Eyes Senior Member

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    That's not so bad. I drive mostly hiway and with the cold air am averaging about 13.7 with my 35's. I am running a 91 tune though and that bumped my mileage by over 1mpg. I've been thinking about reinstalling the factory tune for the rest of the winter to see how it affects my mileage.
     
  3. RedneckHippy

    RedneckHippy Senior Member

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    Did you get your Speedo recalibrated? If you didn’t, those numbers are even better than the evic shows cause you are traveling that much further for every rotation of the tire.
     
  4. Steve Tokash

    Steve Tokash Member

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    What are you doing to fit 37s? They fit with just a level or need something more?
     
  5. RAM-pagingMN

    RAM-pagingMN Senior Member

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    i have a 8 inch lift, 37s and 22x12s but they are forged. each wheel and tire weighs 121 lbs combined. I have the 4.10 gears and this thing still pulls hard. havent got the tune on yet but will here soon.
     
  6. jake4401

    jake4401 Member

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    Gonna be sluggish as hell! Trust me I know and I went back to 33’s because the difference was NIGHT AND DAY!


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  7. Ratket

    Ratket Senior Member

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    Gears take care of “ Sluggish” :)
     
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  8. jake4401

    jake4401 Member

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    True but he said he is not gonna do gears


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  9. Ratket

    Ratket Senior Member

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    I was referencing you going back to 33”s lol.
     

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