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Old 10-09-2016, 01:11 PM   #1
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DEF Usage

How many miles can you travel on a gallon of DEF? I have no idea as to an acceptable consumption rate in miles per gallon.
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Old 10-09-2016, 01:13 PM   #2
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In my 16 F-350 I'm averaging about 2 gal of DEF for every 100 gal of diesel consumption towing.
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Old 10-09-2016, 03:47 PM   #3
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I use about one 2-1/2 gallon Walmart DEF container for each fillup of around 100 gal. of fuel, which gets me around 800 miles. So, maybe 300-350 miles per gallon of DEF? Hope that helps.
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Old 10-09-2016, 05:10 PM   #4
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There is a chart on the side of each container of DEF. When you find out where your engine fits on the chart, you'll have your answer.
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Old 10-09-2016, 07:04 PM   #5
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2016 Mercedes manual for the 4 and 6 cylinder diesels says to expect to use DEF at the rate of 2322 mpg in the van and 1720 mpg in the cut-away chassis. (RV) (1700 +- Seems close for my Sprinter chassis.)
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Old 10-09-2016, 09:17 PM   #6
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Towing uses significantly more DEF than non-towing. When really pushing the truck in the mountains, we used 3.8 gallons in 1500 miles (just filled up at the DEF pump). Note the truck in my signature.
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Old 10-10-2016, 07:09 AM   #7
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The target is 2% DEF or 2 gallons of DEF per 100 gallons of fuel. Long grade pulls and ideling will use slightly more. Level cruising a little less.
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Old 10-10-2016, 07:45 AM   #8
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DEF usage will very as much as MPG of fuel usage, variables, Engine, size, speed, road conditions, mountain driving, weight being towed, etc. as to make it almost impossible to come up with and average consumption rate. For example in our coach equipped with a Cummins, 8.9L ISL motor highway speed 64MPH, I go thru about 2.5 - 3 gls. of DEF every 3000 miles, so I figure ruffly 1gl. per 1000 miles.
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Old 10-10-2016, 07:54 AM   #9
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Does the DEF go into a separate tank? Obviously I don't know much about Diesel engines, but am interested in maybe getting one at some point and this DEF thing is puzzling, to me anyway.
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Old 10-10-2016, 08:02 AM   #10
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Quote:
Originally Posted by parkerbill View Post
Does the DEF go into a separate tank? Obviously I don't know much about Diesel engines, but am interested in maybe getting one at some point and this DEF thing is puzzling, to me anyway.
Google DEF and read for hours.
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Old 10-10-2016, 09:49 AM   #11
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Does the DEF go into a separate tank? Obviously I don't know much about Diesel engines, but am interested in maybe getting one at some point and this DEF thing is puzzling, to me anyway.
yes,,, DEF has it's own tank... NEVER mix DEF and fuel... I don't worry about DEF usage... On a long trip I carry a gallon of DEF . IF needed,, it will get you to the next truck stop/wally world to get more... Be Aware that DEF has a very short experation (sp?) date.... It goes bad in other words.... Look at the dates before you buy off the shelf... If buying bulk at a truck stop,,, I wouldn't really worry about it....
Monkey

I might add if you get your vehicle serviced at a dealer, they should be filling the DEF tank...
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Old 10-10-2016, 10:17 AM   #12
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I fill my def tank at about the oil change interval or a tad before. So that's about every 5,000 miles. At 5 gallons or so of def, that's about 1,000 mpg in a 2016 f250. That's probably similar for most tricks this size. It goes down with towing of course.
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Old 10-10-2016, 11:06 AM   #13
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2016 Ram with combined weight of around 27k, about 1 gal every 350 miles.
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Old 10-11-2016, 02:22 PM   #14
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We've found our DEF consumption to be closer to the 2% of our fuel consumption.


DEF which is injected into the catalyst portion of the exhaust system using a separate injector is an isolated closed system. The rate of DEF use is proportional to the amount of fuel used, as well as the type of driving conditions.


*How much Diesel Exhaust Fluid (DEF) will my truck consume?
Diesel Exhaust Fluid (DEF) consumption is measured as a ratio of diesel fuel use, normally termed the "dosing rate" or "treat rate". Medium- and heavy-duty vehicles have a dosing rate of 2-3%. This means that if your truck has a fuel efficiency of six miles per gallon and a dosing rate of 3% it will use approximately 1 gallon of DEF every 200 miles.
Feedback from a number of fleets suggests that the dosing rate is slightly lower than originally predicted by manufacturers, at around 2.0-2.5%.


*FAQ - discover Diesel Exhaust Fluid (DEF)


Be well.
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