|
|
06-01-2020, 06:14 PM
|
#21
|
Montana Master
Join Date: Mar 2015
Location: West Richland
Posts: 1,253
M.O.C. #17164
|
Tony my TV is a F-350 DRW with the 6.7 diesel. What I have read is the DEF usage drops on the Ford when towing/working the engine hard as it is doing a sort of regeneration because of the higher exhaust temperatures. Driving empty it regenerates more than when I tow especially if I am babying it. I try to drive it like I stole it a bit now driving solo and I have less regenerations. I can lose a little MPG driving it like I stole it or lose MPG when it does a 15-25 minute regeneration.
__________________
|
|
|
06-01-2020, 06:50 PM
|
#22
|
Montana Master
Join Date: Dec 2009
Location: Sebring
Posts: 3,666
M.O.C. #9969
|
Ford, GM, or RAM, DEF has nothing to do with Regens. Regens are related to the DPF, while DEF is sprayed directly into the exhaust stream in the SCR (Selective Catalytic Reduction).
The amount of DEF used is directly related to the amount of Fuel used. When working hard you're burning more fuel thus more DEF is used.
__________________
Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
|
|
|
06-01-2020, 07:05 PM
|
#23
|
Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,475
M.O.C. #4831
|
__________________
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
|
|
|
06-02-2020, 02:47 PM
|
#24
|
Established Member
Join Date: Feb 2018
Location: johnstown
Posts: 46
M.O.C. #21280
|
Quote:
Originally Posted by Carl n Susan
The tire of choice for Montana owners is the Sailun. Be happy, you got a great tire.
|
Quote:
Originally Posted by Carl n Susan
DEF is not a fuel additive and never comes into contact with diesel. It is 32.5% urea and 67.5% de-ionized water regardless of the brand.. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water. DEF is not a fuel additive and never comes into contact with diesel. There is no effect on mileage regardless of the brand used.
|
DEF bought at a convenience store that is out of expiration, kept in the sunlight at high temps or freezing temps will definitely have an effect on the consumption rate of DEF as related to mileage. Purchasing mine at a GM parts counter ensures all these parameters were met thus better miles per gallon of DEF as per my experience. Diesel fuel mileage was not the issue.
__________________
Denny & Cookie-Pennsylvania
2018 Montana 305RL-2019-3500 Duramax-air bags
Sailun tires,2000 watt inverter, Trailer Saver Hitch
|
|
|
06-02-2020, 04:03 PM
|
#25
|
Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,475
M.O.C. #4831
|
Quote:
Originally Posted by Cook-Den
DEF bought at a convenience store that is out of expiration, kept in the sunlight at high temps or freezing temps will definitely have an effect on the consumption rate of DEF as related to mileage. Purchasing mine at a GM parts counter ensures all these parameters were met thus better miles per gallon of DEF as per my experience. Diesel fuel mileage was not the issue.
|
DEF that is old, kept in high temps or sunlight, or freezing temp has its effectiveness reduced significantly. The consumption is not affected. The SCR in modern light duty trucks introduces a fixed amount of DEF per unit of diesel fuel. Burn more more fuel (i.e. towing) and you consume more DEF. The SCR doesn't know or care about the quality of the DEF. Nor is there onboard NOX sensors to determine if the DEF rate is reducing the amount of NOX. The only way to test the effectiveness is via a Smog check (be sure to ask Volkswagen how they handle this situation).
Yes buying at the GM dealer should be a safe way to buy DEF. That is assuming it has been stored properly, not on pallets out back of the shop, and it isn't past its expiration.
Many of us buy the 2.5 gal. jugs at Walmart, O'Rielly's and such suppliers where they turn it over often. If you don't know how to decode the date/expiration code on the jugs here is one source
http://www.rvforum.net/SMF_forum/ind...?topic=73092.0
Others prefer the DEF pumps at truck stops where there is high volume and typically lower price.
The choice is yours to make. There may be times where a Chevy dealer is not available (ever been to Quartzsite?) and another source may be the only option.
__________________
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
|
|
|
06-02-2020, 10:17 PM
|
#26
|
Montana Master
Join Date: Mar 2015
Location: West Richland
Posts: 1,253
M.O.C. #17164
|
I stand corrected on my earlier statement of using less DEF under load. The more load on the engine the more DEF used but you have less regeneration’s because of passive regeneration when working the engine harder. DEF is cheap for the amount used but diesel can be expensive so I like when you have passive regeneration instead of forced regeneration.
Tom Marty
__________________
|
|
|
06-07-2020, 02:38 PM
|
#27
|
Montana Fan
Join Date: Mar 2019
Location: Heber City
Posts: 121
M.O.C. #23676
|
Quote:
Originally Posted by TLightning
You're kidding us right, 75??
|
The speed limit is 80
__________________
Craig and Mary
2017 Montana 3820FK
2020 GMC 3500HD
|
|
|
06-07-2020, 03:06 PM
|
#28
|
Montana Fan
Join Date: Nov 2011
Location: Albany
Posts: 408
M.O.C. #11972
|
At sustained 70-75 mph you'll be the guy on the side of the road with at least one blown tire and a Monty with significant damage.
__________________
2012 3150RL. G614 tires. Hardwired surge protector. Level-Up Hydraulic leveling.
2013 F-350 Lariat 6.7 PSD SRW SC LB 4X4 OEM hitch, air self-leveling on rear. 57-gallon replacement fuel tank. DieselSite water separator/fuel filter.
|
|
|
06-07-2020, 06:19 PM
|
#29
|
Established Member
Join Date: Jul 2009
Location: Redding
Posts: 34
M.O.C. #9515
|
Our 3500 uses 5 gallons of DEF in 2000 miles, almost exactly, when towing. I get an honest 10 MPG towing. Sometimes downhill or tailwind, it does better. A real feel good moment at the pump. I don't use the dash calculation, I calculate each tank manually.
I couldnt be happier with the mileage. My only gripe is that the truck does great on regens towing, passive regens are great. My gripe is as soon as i disconnect and go sight seeing it almost Immediately goes into regen. The dealer has looked at it numerous times and says all is okay. Around town regens are numerous.
__________________
2021 GMC 3500HD Dually
2019 3790RD Legacy
|
|
|
06-07-2020, 06:20 PM
|
#30
|
Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
|
Quote:
Originally Posted by Carl n Susan
DEF is not a fuel additive and never comes into contact with diesel. It is 32.5% urea and 67.5% de-ionized water regardless of the brand.. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water. DEF is not a fuel additive and never comes into contact with diesel. There is no effect on mileage regardless of the brand used.
|
Actually I have known a couple of folks that have added DEF to their fuel tank. It is a $10K mistake.
__________________
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
|
|
|
06-07-2020, 06:32 PM
|
#31
|
Montana Master
Join Date: Nov 2018
Location: Menifee
Posts: 1,109
M.O.C. #22986
|
Quote:
Originally Posted by laverdur
At sustained 70-75 mph you'll be the guy on the side of the road with at least one blown tire and a Monty with significant damage.
|
Dang..thanks for the kind words... FYI the tires are rated at that speed.
__________________
2018 3920fb 2020 GMC Denali 3500 4x4 Duramax, 10 speed Allison. LB SRW, Firestone air bags with Airlift wireless onboard compressor. Anderson Ultimate Hitch. MX4 folding cover. 50gal titan in bed transfer tank. Onan 6500 lp genset installed by me ! Had: 2 HF 3500 Inverters with Parallel Kit
|
|
|
06-07-2020, 06:35 PM
|
#32
|
Montana Master
Join Date: Nov 2018
Location: Menifee
Posts: 1,109
M.O.C. #22986
|
Quote:
Originally Posted by Coronabob
Our 3500 uses 5 gallons of DEF in 2000 miles, almost exactly, when towing. I get an honest 10 MPG towing. Sometimes downhill or tailwind, it does better. A real feel good moment at the pump. I don't use the dash calculation, I calculate each tank manually.
I couldnt be happier with the mileage. My only gripe is that the truck does great on regens towing, passive regens are great. My gripe is as soon as i disconnect and go sight seeing it almost Immediately goes into regen. The dealer has looked at it numerous times and says all is okay. Around town regens are numerous.
|
Just flipped 2k in miles and I had to fill up the def tank. About 900 miles towing. Still in break in-period I guess lol
__________________
2018 3920fb 2020 GMC Denali 3500 4x4 Duramax, 10 speed Allison. LB SRW, Firestone air bags with Airlift wireless onboard compressor. Anderson Ultimate Hitch. MX4 folding cover. 50gal titan in bed transfer tank. Onan 6500 lp genset installed by me ! Had: 2 HF 3500 Inverters with Parallel Kit
|
|
|
06-07-2020, 06:44 PM
|
#33
|
Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
|
Quote:
Originally Posted by Last2Die
Dang..thanks for the kind words... FYI the tires are rated at that speed.
|
I'll stop to help out.
__________________
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
|
|
|
06-07-2020, 06:45 PM
|
#34
|
Montana Fan
Join Date: Mar 2020
Location: Frostbite Falls
Posts: 439
M.O.C. #26015
|
Quote:
Originally Posted by Last2Die
Dang..thanks for the kind words... FYI the tires are rated at that speed.
|
Mine are rated for 87.
|
|
|
06-07-2020, 06:49 PM
|
#35
|
Montana Master
Join Date: Nov 2018
Location: Menifee
Posts: 1,109
M.O.C. #22986
|
Quote:
Originally Posted by 77cruiser
Mine are rated for 87.
|
Rated for posted speed limit +10 mph lmao
__________________
2018 3920fb 2020 GMC Denali 3500 4x4 Duramax, 10 speed Allison. LB SRW, Firestone air bags with Airlift wireless onboard compressor. Anderson Ultimate Hitch. MX4 folding cover. 50gal titan in bed transfer tank. Onan 6500 lp genset installed by me ! Had: 2 HF 3500 Inverters with Parallel Kit
|
|
|
06-07-2020, 06:59 PM
|
#36
|
Montana Master
Join Date: Apr 2017
Location: 1000 oaks
Posts: 961
M.O.C. #19630
|
Just a FYI...The DEF is used to reduce the NOx in the exhaust by use of a catalyst and the Fluid converting the NOx to water and nitrogen which goes out the exhaust.
Regeneration is the method of cleaning the DPF (diesel particulate filter) using injected diesel fuel to raise the temperature in the filter and burn off the soot.
Two different systems in the exhaust stream.
__________________
2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
|
|
|
06-08-2020, 06:45 AM
|
#37
|
Montana Master
Join Date: Jan 2018
Location: Northville, NY
Posts: 811
M.O.C. #21158
|
[QUOTE=Carl n Susan;1185575] The SCR in modern light duty trucks introduces a fixed amount of DEF per unit of diesel fuel. Burn more more fuel (i.e. towing) and you consume more DEF. The SCR doesn't know or care about the quality of the DEF. Nor is there onboard NOX sensors to determine if the DEF rate is reducing the amount of NOX. The only way to test the effectiveness is via a Smog check (be sure to ask Volkswagen how they handle this situation).
Very useful info on this thread. I haven't done a detailed measurement but I seem to use about 3 times the DEF when towing as under local driving. Also when towing fuel consumption is increased by about 40%. Seems there is more that impacts DEF consumption.
__________________
Jim B
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA
|
|
|
06-08-2020, 07:43 AM
|
#38
|
Established Member
Join Date: Jul 2016
Location: Conyers
Posts: 20
M.O.C. #18815
|
In my opinion the Sailuns are the number one tire to run, they are built to dot specifications and are a commercial tire rating.
|
|
|
06-08-2020, 07:48 AM
|
#39
|
Established Member
Join Date: Jul 2016
Location: Conyers
Posts: 20
M.O.C. #18815
|
They are the best tire you could put on. They are commercial tires built to dot specifications.
|
|
|
06-08-2020, 08:06 AM
|
#40
|
New Member
Join Date: Jan 2018
Location: Belleville
Posts: 8
M.O.C. #21142
|
I get my DEF at truck stops for about 2.99/gal, and when I use my EFS card from TSD Logistics I get a little discount on the DEF as well as the fuel.
__________________
2017 FORD F-350SD CC DRW 4x4 4.10 (Black Pearl) | B&W Companion Hitch | Viair 10007 150 psi OBA | Airlift Load Lifter 5000 Ultimate Plus Air Bags | Airlift Wireless Air 72000
2021 Alliance Paradigm 340RL
2018 Montana HC 330RL | Trailair Rota Flex pin box | JT Strong Arms | MORryde Step Above
|
|
|
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Threads |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|