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.++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++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

1600? Wow gotto get me one of those trucks... J/k

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

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.

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.

I have not actually measured mine but I worked out what I thought would be close...930 mpg.

DEF Mileage | Good Sam Community

26 Replies

nomad297
Explorer
Sep 24, 2014
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
Explorer III
Sep 24, 2014
I have not actually measured mine but I worked out what I thought would be close...930 mpg.
mguay
Explorer
Sep 24, 2014
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.
dbbls
Explorer
Sep 24, 2014
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.
nomad297
Explorer
Sep 24, 2014
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
kw_00
Explorer
Sep 24, 2014
1600? Wow gotto get me one of those trucks... J/k

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DEF Mileage

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