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09-09-2014, 04:33 AM
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#1
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Montana Master
Join Date: Apr 2011
Location: Ione
Posts: 582
M.O.C. #11371
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How many miles?
Driving a new F250 2015 and have questions. How many miles will a tank of the fuel additive of DEF go? I know a warning will come on telling be when I need to add the DEF but am I better off just filling the tank every so often? Also when not pulling anything do you ever use the Tow/Haul mode for braking when travelling in steep mountains?
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09-09-2014, 04:42 AM
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#2
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Montana Fan
Join Date: Jan 2013
Location: Jefferson,
Posts: 264
M.O.C. #13170
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My 2011 will take about 1 gallon of DEF per 1000 miles when running empty. It will use more when towing. I just use the + - button on the shift lever for slowing for stop signs etc.
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09-09-2014, 04:44 AM
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#3
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Montana Master
Join Date: Feb 2003
Location: Belvidere
Posts: 1,834
M.O.C. #185
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I never checked the mileage but think it's around the 4,000 mark. What I do is periodically use the instrument display to see when it goes below 1/2 then I fill it.
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09-09-2014, 05:35 AM
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#4
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Seasoned Camper
Join Date: Jun 2013
Location: Hillsdale
Posts: 98
M.O.C. #13509
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When the tank level is below 1/2 you should be able to add 2 1/2 gallons. I check it about very 2 weeks when I'm not on a trip. Check it every couple of days when traveling.
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09-09-2014, 05:59 AM
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#5
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,177
M.O.C. #6433
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Same as above. 3-4,000 not towing and it will drop below 1/2. More frequently when towing.
I do sometimes use tow/haul not towing on steep declines to use exhaust braking rather than manually downshifting.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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09-09-2014, 06:23 AM
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#6
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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I am not really sure. Varies with use, ie towing, town, etc. Bottom line for me, when the half empty mark comes up, I wait a couple of hundred miles and fill with the 2.5 jug from Walmart.
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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09-09-2014, 06:39 AM
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#7
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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I have heard many say that they add def at regular service time.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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09-09-2014, 09:35 AM
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#8
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,389
M.O.C. #4831
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The design intent, according to my Ford source, was the DEF should last until the next oil change (around 7-8K miles). Personally, I check the level via the instrument panel display, and when it says under 1/2, I add a 2 1/2 gallon jug. It seems to be getting around 3-4K miles per addition depending on how much towing I have done.
I too use Tow/Haul or the +/- button on the gear shift when going up/down steep mountains even if I am not towing. It is easier than hitting the brakes all the time.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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09-09-2014, 08:25 PM
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#9
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Montana Master
Join Date: Mar 2012
Location: Redding
Posts: 1,421
M.O.C. #12339
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I travelled average of 3500 - 4000 miles per box of DEF in tow mode. I just keep a box in the truck. Add when I think about it! It's $11.89 at Autozone.
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09-11-2014, 11:43 AM
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#10
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Montana Master
Join Date: Jun 2006
Location: Madison
Posts: 1,239
M.O.C. #5906
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Don't think you can give an absolute mileage for DEF. It depends on the load you are hauling and your driving habits. The tank on our F350 should hold 5 gallons, however we've found that to add that much the tank has to be empty. As others have said we watch the meter and add a 2-1/2 gal jug when the screen says under 1/2 full.
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09-12-2014, 07:13 AM
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#11
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Montana Fan
Join Date: Jan 2013
Location: Jefferson,
Posts: 264
M.O.C. #13170
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I forgot to mention, I saved a 2.5 gal container with the nice flex hose and refill it at a local truck plaza. It costs 2.74 per gallon compared to the 11.99(on sale)I paid for the original container of DEF.
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