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Thread: DEF Fluid Warning
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04-12-2021, 08:20 AM #21
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You are not alone, our 2018 Ram gets @ 10 mpg overall average towing. In two years towing the Solitude the lowest we have gotten is a hair under 8 mpg, the highest 11 mpg towing. Depends on head winds, road terrain, hills, mountains, you get the picture. 18-20 not towing. But we haven't towed in high mountains yet.
For our RAM and DEF usage, weather / ambient temperature plays a big part, during summer or warm weather towing, usage is lower, we can go @700 miles on a DEF tank, we fill DEF when gauge needle is 1/4. Again some of that depends on the road terrain, flat towing is always better. Not towing we get way over 3000 miles on a DEF tank.
Winter or cold weather towing (@35-40 degrees F) the DEF usage goes way up, maybe half the DEF mileage of warm weather towing. We have @ 46K miles on the cummins at this point.Steve & Tami Cass - Escapee's, FMCA Members, Texas Fulltimers Since July 2020
2019 Solitude 3350RL S-Class, 2018 Ram 3500 DRW, Laramie Longhorn, B&W Companion, Texas Class A Non-CDL Drivers License
Sharing the Fulltime Lifestyle - www.youtube.com/@tsrvadventures3219/videos, Nonprofit Channel
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04-12-2021, 08:30 AM #22
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I always carry a 2.5 gallon box with me when traveling just in case but one thing I know for sure, they have to come up with a better spout on these containers. They're a pain in the neck trying not to spill any.
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04-12-2021, 08:42 AM #23
Not sure what brand truck you have, signatures dont show up with Tapatalk. I know for Ford, Ford makes a spout that screws onto the DEF box and is spill proof. I keep it with me for emergencies, but I generally try to fill up DEF at the pump, almost half the price per gallon compared to the box.
Sent from my SM-G950U using Tapatalk2023 Momentum 398M-R
2023 Ford F-450
SOLD - 2021 Reflection 311BHS
SOLD - 2017 Momentum 399TH
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04-12-2021, 08:49 AM #24
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I'll add, my '19 RAM 3500 with the HO drinks DEF at nearly twice what my Chevy Dmax did. And since it seems I am always going uphill, a good day is 11.5 mpg towing. It will be interesting to see if there will be much difference between my current tt, and the 5th wheel I have on order.
2023 Chevy 3500HD CC SB 4x4 Dmax
2021 GD 320G with 8K axles
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04-12-2021, 09:17 AM #25
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I have a Silverado 2500HD I have a funnel but it doesn't work very well. I can't find one that fits in the small DEF fill hole that is long enough and large enough to pour the DEF into so I stick the supplied plastic hose in. It always drips out of the air intake area of the spout. PITA
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04-12-2021, 09:24 AM #262023 Momentum 398M-R
2023 Ford F-450
SOLD - 2021 Reflection 311BHS
SOLD - 2017 Momentum 399TH
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04-12-2021, 12:51 PM #27
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In filing the DEF, I just bought a cheap funnel from Walmart. Keep it in a bag in the truck. BTDT with the ones that come with the jug.
2023 Chevy 3500HD CC SB 4x4 Dmax
2021 GD 320G with 8K axles
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