Dodge Cummins Diesel Forum banner

1 - 20 of 181 Posts

·
Registered
Joined
·
219 Posts
Discussion Starter #1
Has anyone noticed the ungodly amount of DEF the new 3500s burn through? My 2016 2500 would last forever. I'm not happy with how fast this thing goes through DEF so far. I'm at 5k and have used 10 gallons so far.
 

·
Registered
Joined
·
96 Posts
Are you towing/loaded most of the time? I've got 9k on my 2018 2500 and have been through 4 gallons, 2 of them when I towed the camper 1000 miles a few weeks ago.
 

·
Registered
Joined
·
456 Posts
I'm at 1600 miles on my 2019 Ram 3500 Mega with the HO / Aisin. I've pulled my toy hauler for about 400 of those miles and already had to refill the DEF tank today. This isn't going to be acceptable at all. The truck I traded in went 10k on a tank of DEF with the same toy hauler behind it.
 

·
Registered
Joined
·
2,721 Posts
I like the fact she drinks it

90% of the DEF problems are because it’s old, corroded and no longer performs to spec. If I have to have a DEF system I would rather cycle it quickly than let it sit and turn to garbage


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
320 Posts
you should compare it to fuel gallons used...not miles. I was towing my 12,000 lbs. high profile 5th wheel up I 70 with a 20 mph headwind...fuel consumption with 6.7 MPG and is was using a bunch of DEF. The DEF usage should follow the fuel used...for the most part. The lower the MPG the more DEF used.
 

·
Registered
Joined
·
12,870 Posts
I've been getting 300 - 350 mpg to go with the low mileage on my '17 3500, but both seems to be improving.
 

·
White Lightning
Joined
·
12,018 Posts
I've been getting 300 - 350 mpg to go with the low mileage on my '17 3500, but both seems to be improving.
Are you sure on your numbers?

That is entirely low.....for a 3500 riding on 17’s.

From TDR...
https://www.turbodieselregister.com/threads/new-to-me-4th-gen.267047/page-3#post-2595271

Some updated DEF stats from my 2018 RAM 4500.....
142,891.2 miles logged
331.841 gallons of DEF purchased
$928.12 dollars
430.602 avg mpg DEF
10.33 avg mpg over lifetime of truck
$0.00649529 per mile in DEF costs
Or.....easier to understand...$6.49 per 1,000 miles driven in DEF costs
100% of DEF has been bulk at the pump
 
  • Like
Reactions: Cummins0867

·
Registered
Joined
·
12,870 Posts
Are you sure on your numbers?

That is entirely low.....for a 3500 riding on 17’s.
Not perfectly sure, no. On the latest trip it used about a third of what I had expected, and I haven't filled the tank up to be able to get good numbers since.

So, I posted the most recent numbers I had. Which would be low even for a 5500 on 44s, I think.
 

·
Registered
Joined
·
330 Posts
Mine used practically nothing until I started towing 15k dump trailer a bunch. Then it started using quite a bit. I've got about 4k on it so far (2k miles with the loaded dump on it) and my I think I've gone though almost 2 tankfuls of DEF. What's in a tank. 5 gallons? Or 8?
 

·
Sasquatch
Joined
·
3,638 Posts
The newer ones might use a little more DEF due to the emissions. I'd take high DEF usage over high EGR usage.

DEF usage is usually best compared to fuel consumption, the earlier SCR equipped ISB engines typically consumed 50:1 diesel to DEF.

NOx output (which SCR/DEF, EGR and retarded timing tries to combat) increases with heat(NOx starts to form at around 4000 degrees), so you might go beyond that 50:1 when towing. Future generation engines will probably use even more DEF since the EPA won't be giving as many hall passes for NOx output at full throttle. Currently, they give permission to exceed NOx beyond the standards under certain conditions that are agreed upon.
 

·
Registered
Joined
·
786 Posts
I haven't had mine long enough to see if it actually uses more def. but one thing im thinking is that the gauge is far more accurate than before. on my '16 the def tank would be at nearly half before the gauge started coming off full mark. then it dropped like a rock. on the '19 it starts reading sooner. but i only have 4k miles on mine so i dont have solid numbers yet.
 

·
Registered
Joined
·
330 Posts
A C&C is nine, a pickup is five, I think.
I believe you're correct. So mine at 5 gallons. 2 tanks in 4000 miles= 400 MPG DEF. I dont know if that's bad.
 

·
Registered
Joined
·
330 Posts
I haven't had mine long enough to see if it actually uses more def. but one thing im thinking is that the gauge is far more accurate than before. on my '16 the def tank would be at nearly half before the gauge started coming off full mark. then it dropped like a rock. on the '19 it starts reading sooner. but i only have 4k miles on mine so i dont have solid numbers yet.
In the Owners manual, they do address this. It says something about the needle moving down from the full mark after having used a full gallon or more.
 

·
Registered
Joined
·
330 Posts
Are you sure on your numbers?

That is entirely low.....for a 3500 riding on 17’s.

From TDR...
https://www.turbodieselregister.com/threads/new-to-me-4th-gen.267047/page-3#post-2595271

Some updated DEF stats from my 2018 RAM 4500.....
142,891.2 miles logged
331.841 gallons of DEF purchased
$928.12 dollars
430.602 avg mpg DEF
10.33 avg mpg over lifetime of truck
$0.00649529 per mile in DEF costs
Or.....easier to understand...$6.49 per 1,000 miles driven in DEF costs
100% of DEF has been bulk at the pump
What percentage of the time were you towing heavy? I'm averaging 400 MPG DEF and I'm towing 15k lbs 1/2 the time.
 

·
Registered
Joined
·
330 Posts
I'm at 1600 miles on my 2019 Ram 3500 Mega with the HO / Aisin. I've pulled my toy hauler for about 400 of those miles and already had to refill the DEF tank today. This isn't going to be acceptable at all. The truck I traded in went 10k on a tank of DEF with the same toy hauler behind it.
The same happened to me at 1600. My needle didnt move until 1k . Then I started Towing heavy and it started dropping like a hot rock. I believe that was due to 2 factors. There is such a reserve before the needle even begins to drop. And Towing really sucks it down. No experience with DEF so I cant really even comment. At 4k (2k towing, 2k empty) I'm averaging 400 MPG DEF. Seems close to standard.
 

·
Registered
Joined
·
320 Posts
about 500 mpg for DEF towing my 5th wheel 12,000 lbs....seems like it uses more in the summer also.
 

·
White Lightning
Joined
·
12,018 Posts
What percentage of the time were you towing heavy? I'm averaging 400 MPG DEF and I'm towing 15k lbs 1/2 the time.
Generally......52% to 53% of the time.
 
1 - 20 of 181 Posts
Top