Forum Discussion

GoPackGo's avatar
GoPackGo
Explorer
Sep 24, 2014

DEF Mileage

4-25-2015. For anyone who is interested - I just posted an update on page 3 with my latest mpg after just refilling the DEF tank yesterday.

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Just FYI in case anyone wants to know -

I have a 2013 F350 4x4 CC LB dually with 3.73 gears pulling a 14,000 GVW 5th wheel and I recently started keeping track of when I refill with DEF.

The truck has about 24,000 miles on it.

It looks like I'm getting about 1,600 MPG with about 90% towing. That's running 55-60 mph. I've been in Wyoming, Colorado, and northern New Mexico since the beginning of July so I suspect the mileage would be a little better if I was on level ground and at lower altitude.

Tim

26 Replies

  • 4x4ord wrote:
    I have not actually measured mine but I worked out what I thought would be close. The number I came up with was identical to yours...1600 mpg.


    Can that article I linked to really be that far off? I don't doubt what you're saying -- I just wonder where that article came up with the numbers it did.

    Bruce
  • 4x4ord's avatar
    4x4ord
    Explorer III
    I have not actually measured mine but I worked out what I thought would be close...930 mpg.
  • A friend of mine has the same truck as you but short box. He hasn't calculated his DEF MPG but told me it was WAY up there. I am blown away with your calculations and it doesn't seem possible while towing. My GM while empty gets about 1200 DEF MPG and 18 Fuel MPG. When towing my Fuel MPG is an average of 11 and my DEF MPG is in the area of 6-700. As fuel mileage drops...DEF consumption goes up. The more fuel you burn, the more DEF you need to drop emissions.
  • That is more than I get but I run a little faster, between 60 and 65. My trailer weights about the same. I run about a 1000 miles per gallon towing.
  • Are you sure your math is correct? According to this article, you are getting incredible mileage. The article bases DEF usage with a vehicle getting 6 MPG of diesel, saying it will use about one gallon of DEF per 300 miles driven. I would assume that if your truck gets 12 MPG, your DEF usage should be about 600 MPG.

    Bruce