250 vs 450 def usage
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Laughing Gas
Joined: Aug 2017
Posts: 802
Likes: 197
From: Tupelo, MS
250 vs 450 def usage
I had another thread on this but wanted to pose the question a bit differently hoping you guys can educate me on this.
2018 F250 6.7 3.55 gears 6 sp unloaded def usage was 10000 miles or 1333 mpg 15.5 mpg diesel
2021 F450 6.7 4.30 gears 10 sp unloaded def usage was 3000 miles or 400 mpg. 14 mpg diesel
Obviously the 450 weighs more, has lower gears. What am I missing here? I've read reports of guys with newer 450's getting 1100 miles on a tank of def towing a 5th wheel camper. Last summer I towed our 5th wheel with the 250 and used a tank of def in 5000 miles of almost constant towing.
Help me understand why such a dramatic increase of def usage when all other variables are same or very similar.
Is weight loss the answer here or is this something that Ford needs to review/reprogam?
2018 F250 6.7 3.55 gears 6 sp unloaded def usage was 10000 miles or 1333 mpg 15.5 mpg diesel
2021 F450 6.7 4.30 gears 10 sp unloaded def usage was 3000 miles or 400 mpg. 14 mpg diesel
Obviously the 450 weighs more, has lower gears. What am I missing here? I've read reports of guys with newer 450's getting 1100 miles on a tank of def towing a 5th wheel camper. Last summer I towed our 5th wheel with the 250 and used a tank of def in 5000 miles of almost constant towing.
Help me understand why such a dramatic increase of def usage when all other variables are same or very similar.
Is weight loss the answer here or is this something that Ford needs to review/reprogam?
Senior User
Joined: Jun 2011
Posts: 383
Likes: 3
They have different engines and programming strategies. The modern 6.7L strategy is to use less EGR and more DEF.
To me the answer is deal with using more. If you want to spend the money to delete to save from filling up then so be it. All modern diesels are using more DEF than their previous generation.
To me the answer is deal with using more. If you want to spend the money to delete to save from filling up then so be it. All modern diesels are using more DEF than their previous generation.
Hotshot
Joined: Jul 2013
Posts: 14,284
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I have a 2019 f-450 6.7
in 7800 miles, I added def 1 time....a complete container....right now I am 3/4ths full.
is the Nox sensor a factor in DEF usage? More Nox, more def? I use cetain boost additives so my Nox levels may be less so may be using less def.
in 7800 miles, I added def 1 time....a complete container....right now I am 3/4ths full.
is the Nox sensor a factor in DEF usage? More Nox, more def? I use cetain boost additives so my Nox levels may be less so may be using less def.
Super Moderator
Joined: Aug 2008
Posts: 37,383
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From: Frederick, MD
I run through a tank of def every 3K miles, extensive heavy towing.
My 2013 was used the same way and a tank would go 4500 miles to about 5K miles.
It is the motor and the emissions differences.
My 2013 was used the same way and a tank would go 4500 miles to about 5K miles.
It is the motor and the emissions differences.
More Turbo
Joined: Dec 2018
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Based on your usage to mine it appears as though the F450 must be tuned to use way more DEF. What is your overall average fuel consumption at?
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Cargo Master
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Super Moderator
Joined: Aug 2008
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From: Frederick, MD
Gets as low as 9.5 to 12 when towing it would appear.
More Turbo
Joined: Dec 2018
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I find this interesting .... about half my miles have been towing and my towing milage ranged from about 6.5 to 12 mpg with my overall average at 12 mpg. According to what my usage has been to date I should be at 11000 miles when my DEF reaches 1/4 full. I never paid any attention to the DEF usage on my 2017 but my gut feeling is that is would have been similar.
Super Moderator
Joined: Aug 2008
Posts: 37,383
Likes: 1,867
From: Frederick, MD
wonder if the F350 vs F450 and gearing has something to do with this?
6.5 would have to be some serious hills.
When heading out of Maryland to Ohio on I 68 I have gotten as low as 5.5 when I had my 6.4 but that is some serious foot on the floor time.
6.5 would have to be some serious hills.
When heading out of Maryland to Ohio on I 68 I have gotten as low as 5.5 when I had my 6.4 but that is some serious foot on the floor time.
More Turbo
Joined: Dec 2018
Posts: 669
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When I got the 6.5 mpg I was towing on flat ground but had a old International three ton on a tandem dually equipment trailer ... had I not been watching the mileage meter I never would have guessed the engine was working that hard. At 6.5 mpg and 70 mph our diesel engines are averaging an output of about 230 hp. The new Powerstroke can make that kind of power at 1500 rpm. I had 10 th locked out and found it handled the load easily at 70 mph running in 8th and 9th gear. (3.31 gears)
Laughing Gas
Joined: Jul 2017
Posts: 1,203
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When I drove my 2017 F-450 1600 miles across the country empty, with a headwind 1/2 the way, and average 13mph for the trip the DEF gauge barely moved. It drinks it when towing though. I haven't tracked it closely but I would bet 3000 miles or less towing to a tank of DEF wouldn't be that far off. My dad's 2012 F-450 CC work truck uses barely any.