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Old 04-26-2015, 09:19 PM   #1
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DEF useage

Finally got the 38A back from the dealer after 3 weeks with temp.repairs to the Lighting issue,Freightliner is still trying to locate a replacement wire harness to correct the problem.We are leaving for Fort Wilderness in 10 days and my question is about with the 340 Cumming and how many miles are you able to go per gallon of DEF or how much DEF per tankful of fuel.
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Old 04-26-2015, 09:25 PM   #2
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most vehicles use DEF at a rate of around 2% per gallon of fuel
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Old 04-26-2015, 09:35 PM   #3
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I left Nashville went to Maine and other places 3600 miles and had above 1/4 of DEF when I got home.


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Old 04-26-2015, 09:51 PM   #4
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I don't know about per gallon, but you can go across the country on a tank of it.
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Old 04-26-2015, 10:34 PM   #5
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I don't know about per gallon, but you can go across the country on a tank of it.
50 gallons diesel = approx. 1 gallon DEF per Cummins and my experience.
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Old 04-26-2015, 10:55 PM   #6
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Quote:
Originally Posted by oldkeywest91 View Post
Finally got the 38A back from the dealer after 3 weeks with temp.repairs to the Lighting issue,Freightliner is still trying to locate a replacement wire harness to correct the problem.We are leaving for Fort Wilderness in 10 days and my question is about with the 340 Cumming and how many miles are you able to go per gallon of DEF or how much DEF per tankful of fuel.
My Chevy 3500 uses 2.5 Gal per 5,000 miles..hope that helps.
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Old 04-27-2015, 12:29 AM   #7
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50 gallons diesel = approx. 1 gallon DEF per Cummins and my experience.
Sounds about right.
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Old 04-27-2015, 06:53 AM   #8
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Thanks,gives me an idea on how far I can travel on tank while on vacation.
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Old 04-27-2015, 08:45 AM   #9
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Oldkeywest91, the DEF system is not like your fuel tanks, that you can run down to near empty. If you do, you will need to get towed and the red engine symbol will come on. I get about 3000 miles on a tank of DEF. I have indicator lights near my fuel gage. 4 green lights full, 1 green light ok, turns to yellow - should have filled it at 1 green, yellow turns to red, don't stop the engine, will not restart, got about 400 to 500 miles (per Freightliner) till shutdown and having to get towed in.


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Old 04-27-2015, 10:12 AM   #10
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Oldkeywest91,
We get about 350 miles (+/-) per gallon of DEF so if you are going to FW, you should use somewhere in the neighborhood of 7 gals of DEF for the round trip- estimating a 2500 miles trip. Your tank holds 13 gallons. This, of course, is just an approximation.
Tom
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