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Old 09-02-2016, 02:34 PM   #21
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I tow with mine the majority of the time. Probably 4000-5000 miles between DEF fill-ups.
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Old 09-02-2016, 03:45 PM   #22
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I have about 1800 miles of mixed city / highway / towing. The DEF gauge still reads full but from what I read on the Dodge forums they do that till about 1/2 tank of DEF and from there drop like a rock.
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Old 09-02-2016, 04:36 PM   #23
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Hard to know for sure. My 2015 GMC 2500 was under GM's free 2 year maintenance and when I did the 4 free oil changes they topped off the DEF tank for free also. I think I've purchase 6 2.5gal bottles at Walmart. Total miles to date is 29,830 and the DEF was topped off just before I got home. If I had to guess, it probably uses about a gallon every 800-1000 miles. I buy the $8.87 Walmart brand or the Pilot J bulk ($2.90 gal.) and that works out to about 1/3 to 1/2 cent a mile.
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Old 09-02-2016, 07:58 PM   #24
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Zero DEF!

2006 F350 6.0
X2
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Old 09-02-2016, 10:31 PM   #25
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Hard to know for sure. My 2015 GMC 2500 was under GM's free 2 year maintenance and when I did the 4 free oil changes they topped off the DEF tank for free also. I think I've purchase 6 2.5gal bottles at Walmart. Total miles to date is 29,830 and the DEF was topped off just before I got home. If I had to guess, it probably uses about a gallon every 800-1000 miles. I buy the $8.87 Walmart brand or the Pilot J bulk ($2.90 gal.) and that works out to about 1/3 to 1/2 cent a mile.
I found out that my GM dealer was not topping off my DEF tank during my free oil changes.He was only adding 2 gallons when my tank reading was about 20% so he should have been adding about 4 gallons at that point. When I confronted him about it he gave me 2 additional gallons. I think they were trying to save themselves some money by only adding just 2 gallons and not topping it off.
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Old 09-03-2016, 06:14 AM   #26
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I have a 2014 Ram. Last time I figured I used about 1 gallon to 700 miles in everyday driving. Love the gauge Ram puts in their trucks
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Old 09-03-2016, 07:12 AM   #27
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While in Texas I traded the gaser for a 2015 chev duramax and since then I have put 4000 miles on it (half with a 36' trailer) and when I went to top it off it would only take 2.5 gallons.
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Old 09-03-2016, 07:14 AM   #28
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I have a 3500 Chevy with 5 gal tank and get 1000 miles a gal
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Old 09-03-2016, 07:22 AM   #29
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I have a 2015 with 30,000 km and have never filled the DEF tank. Its part of free service from the dealer. It only regions every 800 km even when towing. The newer diesel use fuel to kick the temp up more and use less DEF. Strictly Stock engine.
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Old 09-03-2016, 02:48 PM   #30
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X2
Are you bullet proofed?
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Old 09-03-2016, 05:17 PM   #31
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Are you bullet proofed?
No, I am not. I guess I should consider myself lucky, but when you run the numbers, I'm in the majority. Only about 12% of the International 6.0 motors had issues. Of course, you hear more from the 12% than the rest of us 88%. I bought my 2006 F-350 truck with 10k on it and last trip coming back from Goshen International Rally, I flipped 205k. I get 17 mpg going back and forth to work and 13.5-14 mpg pulling my 15,000 lb 5er. With the 4.30 rear end and dual rear wheels, it has a GCWR of 26,000lbs. The 6.0 motor has more power than I need as I use cruise to keep it under 65-70mph. Only used tow/haul a couple of times in the mountains.
Like I said, it's been great for us and no issues other than normal wear and tear.
Happy camping!!
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Old 09-03-2016, 07:24 PM   #32
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No, I am not. I guess I should consider myself lucky, but when you run the numbers, I'm in the majority. Only about 12% of the International 6.0 motors had issues. Of course, you hear more from the 12% than the rest of us 88%. I bought my 2006 F-350 truck with 10k on it and last trip coming back from Goshen International Rally, I flipped 205k. I get 17 mpg going back and forth to work and 13.5-14 mpg pulling my 15,000 lb 5er. With the 4.30 rear end and dual rear wheels, it has a GCWR of 26,000lbs. The 6.0 motor has more power than I need as I use cruise to keep it under 65-70mph. Only used tow/haul a couple of times in the mountains.
Like I said, it's been great for us and no issues other than normal wear and tear.
Happy camping!!
Sounds great, I thought I might have been in that 88% but wasn't willing to take the chance after some evidence popped up. I do get virtually the same fuel mileage at those speeds.

I purchased mine 2 years ago with 72K and had just turned 90K with two EGR valve replacements. I tested it and found out that I had a constant 10 degree difference between EOT and ECT so I elected to do a partial Bullet proof. (redesigned EGR and oil coolers) Now both temps are almost always identical.

Take care.
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Old 09-03-2016, 07:35 PM   #33
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Thumbs up DEF Use

We can get to zero DEF if we could de-fund the EPA!! I am at under 1 gal per 1000 miles in a 2016 F250. Be sure to set your DEF calculations on the dash to Tow or Normal as needed.
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Old 09-03-2016, 08:06 PM   #34
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I took our 2016 F350 Dually Lariat for its first oil change at 8000 kms in early July. I'd just placed 2.5 gallons of DEF in to the tank a couple of weeks earlier while towing a 40' full profile 5er. The dealer allegedly filled it up again at the oil change but while I was recently towing through Washington and Oregon I had to out in another 2.5 gallons and when I returned home it took another gallon. So far the total milage for the truck is just under 13,000kms. About half of this has been towing.

Fuel seems to come out at 11mpg (21l/100km) towing and 15mpg (15l/100km) urban/hwy mixed.
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Old 09-03-2016, 11:21 PM   #35
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I have a 2015 RAM 3500 dually. The DEF tank holds 5 gallons. I fill it when it gets to 1/2 on the DEF gauge. I use 2.5 gallon Walmart. I get 1200-1300 miles per 2.5 gallons.
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Old 09-03-2016, 11:32 PM   #36
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It's actually a 5.7 gallon tank and will read full on the gauge when about 90% full. So it's possible to use %10 without the gauge ever moving off full.

But yes 2.5 gallons is roughly half.


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Old 09-04-2016, 03:33 AM   #37
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Originally Posted by dea49 View Post
Zero DEF!

2006 F350 6.0

Quote:
Originally Posted by PIGMAN View Post
X2
X3. And I'm an 88%er!
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Old 09-04-2016, 04:25 PM   #38
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We can get to zero DEF if we could de-fund the EPA!! I am at under 1 gal per 1000 miles in a 2016 F250. Be sure to set your DEF calculations on the dash to Tow or Normal as needed.
I agree! The EPA should be only an advisory organization for Congress and they should make laws using that information.

Case in point...

My Grand Cherokee gets around 28 mpg with all the emission control. In Australia they get around 50 mpg without it. What is better, save 10% on emissions per gallon or double the mileage per gallon and use 50% less fossil fuels overall? They have these tree huggers bamboozled!
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Old 09-04-2016, 07:31 PM   #39
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I agree! The EPA should be only an advisory organization for Congress and they should make laws using that information.

Case in point...

My Grand Cherokee gets around 28 mpg with all the emission control. In Australia they get around 50 mpg without it. What is better, save 10% on emissions per gallon or double the mileage per gallon and use 50% less fossil fuels overall? They have these tree huggers bamboozled!
Give you better fuel mileage so it cuts into the oil companies sales?
Emissions and economics is a fine balance, with the scale tipping towards oil companies.
There are other factors in that equation too. Fuel quality and rating is one. PCM flash is another.
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