Better MPG while towing 6.4L ... what I've found

Discussion in 'Heavy Duty' started by dexter, Apr 14, 2019.

  1. dexter

    dexter Senior Member

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    I full time in a RV and do a lot of towing across the country.

    Here is what I've found.

    Generally I get 8-9 mpg while towing at 60mph - I'm not in a rush.

    Wind resistance is the key factor.

    Midgrade gets about .3 - .5 better mpg then regular

    Lucas fuel system cleaner $25/gallon adds another .3 mpg
     
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  2. mtofell

    mtofell Senior Member

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    This sounds about right from my experience with the same truck. Speed is the biggest factor I've found. Of course, hills and wind matter as well. Still, there are the endless posts of guys claiming to tow @ 75 and get 12mpg :)
     
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  3. RoadRamblerNJ

    RoadRamblerNJ Senior Member

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    I rarely tow but, using Lucas does get me another .4 mpg. Didn't see any gain using 89 over 87 though.
     
  4. RoadRamblerNJ

    RoadRamblerNJ Senior Member

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    I can't get 12 mpg ever. But thats OK. I smile every time that 392 swallows another gulp!
     
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  5. Rambojoe

    Rambojoe Member

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    Hey, which gears do you have? I get about 6-7 but I run 70 because the truck kind of settles there. I have 35s and 3.73 which might be the issue
     
  6. sandawilliams

    sandawilliams Senior Member

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    50,000 miles towing 8800 lbs. and another 1500 in the bed. Long term mileage over all types of terrain and elevation is 9.3 mpg @ 65 mpg. (hand calculated) 2014 CC 6.4 long bed. Tried all grades of gas and none seem to make a difference.
     
  7. bdc2

    bdc2 Member

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    That's pretty dang good.
     
  8. dexter

    dexter Senior Member

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    4.10 see sig line
     
  9. RoadRamblerNJ

    RoadRamblerNJ Senior Member

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    FYI, sig line isn't visible when you do this on a phone. I see nothing that describes any aspect of your truck. I use my phone only for this forum. Am I missing stuff?
     
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  10. mtofell

    mtofell Senior Member

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    Nothing major.... just the pictures of topless super models, vouchers for free beer and the free download-able passes to sporting events in your area. :) :)
     

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