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Old 02-27-2014, 08:36 PM   #15
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I have only added DEF to my 2013 Dodge once. Assuming it was delivered with a full tank I used 3.44 gallons in 2100 miles at a cost $9.44 at the pilot pump ($2.79 gal)
That works out to about half a cent a mile. Less if I didn't start with a full tank.
Fairly insignificant in the scheme of things
Just to update, apparently the truck was not delivered with a full DEF tank as it indicated 1/2 when I filled it after 2000 miles.

I now have 2000 miles on the second fill and the gauge is just moving off the full mark. Almost all towing miles with a 5000 lb trailer
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Old 02-27-2014, 09:36 PM   #16
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I drove a 2650 mile round trip to Sarasota, FL with the Airstream. I had a DEF warning with 750 miles remaining just before Pennsacola on the way there. I put in 2 1/2 gallons at Pennsacola. About 2/3 of the way home, another DEF warning. Towing obviously uses a lot more than running around town. I burned 200.5 gallons of diesel on the trip.
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Old 02-27-2014, 10:18 PM   #17
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I drove a 2650 mile round trip to Sarasota, FL with the Airstream. I had a DEF warning with 750 miles remaining just before Pennsacola on the way there. I put in 2 1/2 gallons at Pennsacola. About 2/3 of the way home, another DEF warning. Towing obviously uses a lot more than running around town. I burned 200.5 gallons of diesel on the trip.
I think we have the same exact truck. Mine seems inconsistent too. I can't get the "rhythm" of usage, though towing definitely drains it faster. The lack of a gauge isn't helpful either. The DIC just indicates it's ok until you get to 20% remaining but even then, you have to intentionally search for that info - or wait til you get the warning.

GM should upgrade the software to at least track the actual % available so you don't have to guess.
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Old 02-28-2014, 09:37 AM   #18
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We figure at about 180-200 miles per DEF gallon on the Peterbilts at work (Cummins 15L engine 435HP/1650TQ). Or, 2,700-3000 miles per tank (15-gl). Trucks average a little above 5-mpg overall (4.5 mpg loaded, and nearer 6 empty). There is nothing "aero" about these rigs.

I ran a 1,070-mile trip over a day and a half. I expect to top up the DEF tank at the shop with somewhat over 5-gls when next called out.

The companies that are strictly OTR, have reduced engine idle hours due to an APU and use engine auto shutoff, likely do better than us as we run oilfield loads where fuel economy is not the same concern.

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Old 02-28-2014, 10:46 AM   #19
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I have 2011 F250 with 43K miles. To date I have used 38.75 gallons of DEF which computes to a little over 1100 miles per gallon. Minor hassle but worth it for better emissions. I've also been told by the dealer that long idle periods affects DEF consumption.
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Old 02-28-2014, 11:30 AM   #20
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Our 2011 Chevrolet Duramax 3500 now has almost 70,000 miles on it. We are always running with the 3,000# Outfitter truck camper in the bed and we are towing the Airstream about half the time. We average about 1,000 miles per gallon of DEF.

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Old 02-28-2014, 06:44 PM   #21
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We get about 1,500 miles per gallon of DEF in our Mercedes GL 350. I fill the DEF tank every 10,000 miles and flush it every 20,000 per the factory service guide - which seems dumb but I am not about to screw with my warranty. Cost is negligible.

In terms of fuel economy, we average about 26 highway, 22 overall and 15 when towing.
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Old 02-28-2014, 11:03 PM   #22
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That is nice to know about the ML350.

Maybe the reason for flushing is that the DEF does have a shelf life.
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Old 03-18-2014, 09:42 AM   #23
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Quote:
Originally Posted by RickDavis View Post
I have only added DEF to my 2013 Dodge once. Assuming it was delivered with a full tank I used 3.44 gallons in 2100 miles at a cost $9.44 at the pilot pump ($2.79 gal)
That works out to about half a cent a mile. Less if I didn't start with a full tank.
Fairly insignificant in the scheme of things
Just to update my own post, apparently the truck was not delivered with a full def tank.
Not knowing how much would be used I bought a 2.5 gallon jug of the stuff to carry. I have been hauling it around since September when I had filled the DEF tank. As of today I was at the 2500 mile mark so I decided to use the jug before it died of old age.
I was not able to use it all so the DEF mileage is over 1000 mpg.
In addition I notice the stuff is for sale about everywhere now so there is probably no need to carry any of it around.
Almost all my driving has been towing about 5000 lbs.
At this point it appears the cost is insignificant and the availability is good.
If the delivery system proves reliable over the long term the use of DEF should not be a big deal.

I am also happy with the fuel mileage which is running around 15.5 (hand calc.) overall mostly towing for the last 1400 miles. This appears to be only slightly less than my 99 which was not a 4x4 and was 1500 lbs lighter
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Old 03-18-2014, 11:38 AM   #24
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My colleuague took delivery of his Grand Cherokee a few months ago, and had a DEF fluid warning mere weeks later. The dealer was surprised too, and they determined that Jeep does not fill the DEF tank at the factory, that is supposed to be a dealer prep item. But the dealer didn't know it with his early diesel deliveries.

MY BMW X5 had a full DEF tank, I think, and may have been topped up when it had its warranty-covered oil change: they don't show everything on my paperwork so I will have to ask them at my next visit.

My airstream is self-powered by gasoline, so the 75 gallon tank helps.
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Old 03-18-2014, 02:24 PM   #25
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I have a '14 Ram 2500 Laramie 4x4 with the 6.7l Cummins. Just turned 6,000 miles on the ODO, of that all but a couple of hundred are tow miles. The DEF gauge showed "Full" when I took delivery, but being the curious sort.....I had a couple of jugs that I'd gotten at Wally's, and it took another gallon (tank is supposed to hold 9). Since it was completely full when I started towing, my calculation based on a refill is "it ain't worth worrying about." The truck is so awesome -- does everything I expected and much better -- that I really am not much concerned about it. Oh, I did add a 37 gal. aux tank in the trunk bed. I can go a LONG way with 73 gallons of diesel...
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Old 03-19-2014, 05:03 AM   #26
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Odd, I've been wondering about the meager DEF usage on my GL350. 18K miles (I deferred DEF service at the 10K service) and I've added one measly gallon and have never gotten a warning. Almost afraid to mention it at my service B next week, afraid they will "fix" it. If anyone knows how the GL's usage could be so minuscule please advise.
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Old 03-19-2014, 07:30 AM   #27
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DEF usage is a function of fuel usage, not miles. Although most of us drive pretty much the same kind of routine (low idle times...etc.) to compare miles per gallon of DEF isn't necessarily accurate. For example a diesel that gets 25 mpg of fuel consumption will use less DEF per mile than a diesel that gets 18 mpg of fuel usage.
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Old 03-19-2014, 07:37 AM   #28
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I have a 2013 GMC 2500 HD Duramax/Alison. The dealer told me they topped off the tank when I took delivery, BS. At 800 miles I dumped 5 gallons into the tank to fill it. I filled it again at 2800 miles and it took 5 quarts. 2.5 quarts per 1000 miles.
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