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04-25-2017, 05:21 PM
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#1
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Member
Join Date: Jul 2014
Location: out west in the mountains
Posts: 51
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? for dually owners
Buying my 1st dually.
Going from a 2015 Ram 3500 SRW to a 2017 Ram 3500 dually.
Was curios about MPG. With the same rear end going unladen getting 21 mpg highway driving.
By going to the dually I know I'll be getting a bit less. Are we talking a minor or major difference?
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04-25-2017, 08:39 PM
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#2
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Senior Member
Join Date: May 2013
Location: Ontario, California
Posts: 2,429
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minor
__________________
[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
Newmar Owners Club
USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003
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04-25-2017, 08:47 PM
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#3
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Senior Member
New Horizons Owners Club
Join Date: Aug 2011
Posts: 481
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It depends a lot on the gearing in the rear end. We had a 2500 with a 4.1 rear end and got about 12 mpg. Our 450 has a 4.3 rear end and gets about 10 mpg.
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04-26-2017, 04:18 AM
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#4
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Senior Member
Join Date: Sep 2012
Posts: 542
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2017 Ram Dually has the option of 3.42, 3.73, and 4.10 rear ends where your SRW is only available as a 3.42.
The gearing is the potential difference in MPG.. the duals out back make a very minimal difference.
__________________
2014 Ram 3500 CCLB 4x4 Dually 68RFE, 370/800 Cummins 3.42 highway gear - Deep Cherry Red
2016 Coachmen Chapparal 360IBL
Sold - 2005 Dodge Ram 2500 SLT QCLB 4x4 - Cummins Power
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04-26-2017, 06:30 AM
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#5
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Member
Join Date: Jul 2014
Location: out west in the mountains
Posts: 51
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The new truck will have the Aisin trans with the 3.73 rear end.
Thanks
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04-26-2017, 07:05 PM
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#6
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Senior Member
Join Date: Apr 2014
Posts: 335
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My '14 RAM dually with the 4.10 gets 15-16 solo doing 75. Dually's do get less fuel mileage. But I'm happy.
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DYNAMAX DX3 37TS
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04-26-2017, 09:18 PM
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#7
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Senior Member
Join Date: Sep 2009
Location: Florida
Posts: 779
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Here is an honest comparison. I own a 2016 Dodge 2500. My brother who lives in the same town has a 2016 Dodge 3500 DRW. Both have the same engine, transmission and rear gear ratio of 3.42.
I average 19 mpg hwy / 15-16 mpg city. Typically I average 17 mpg mixed. My brother sees 16 mpg hwy / 13 city with 14 mpg mixed. Keep in mind we live in the Colorado mountains.
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2019 Newmar Canyon Star 3719
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04-27-2017, 04:46 PM
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#8
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Senior Member
Join Date: Mar 2016
Posts: 220
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Our RAM is equipped with the Aisin transmission and 4.10 gears. It's rated to tow 30,190 lbs. It averages 14-16 mpg combined when not towing, 8-9 towing our 20K lb 5th wheel. If I had a lighter foot and cruised at lower speeds I could get better mileage.
If you plan to, or may in the future tow more than 15K lbs I recommend 4.10 gears. The small penalty you may pay in fuel economy will be offset by improved performance while towing. My theory is that if you buy a truck equipped to perform the toughest job you may ever ask it to do, you'll never be sorry.
Happy trails,
__________________
Bill
'16 Mobile Suites 39DBRS3 '20 RAM 3500 Laramie Crew Cab Dually 4X4 6.7L HO Cummins, Aisin trans, 4.10 gears, Rear Air Suspension, Andersen Ultimate 2
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04-27-2017, 07:39 PM
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#9
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Moderator Emeritus
Monaco Owners Club Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 13,426
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I averaged in the high 15s unloaded with the 3:73 rear end empty and 10 towing a 9000 lb 5th wheel.
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Dennis and Katherine
2000 Monaco Dynasty
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04-28-2017, 12:39 AM
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#10
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Senior Member
Join Date: Jul 2015
Location: Currently; SW Cali. Sunny & warm!
Posts: 1,323
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Quote:
Originally Posted by NW Explorers
Our RAM is equipped with the Aisin transmission and 4.10 gears. It's rated to tow 30,190 lbs. It averages 14-16 mpg combined when not towing, 8-9 towing our 20K lb 5th wheel. If I had a lighter foot and cruised at lower speeds I could get better mileage.
If you plan to, or may in the future tow more than 15K lbs I recommend 4.10 gears. The small penalty you may pay in fuel economy will be offset by improved performance while towing. My theory is that if you buy a truck equipped to perform the toughest job you may ever ask it to do, you'll never be sorry.
Happy trails,
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Welcome to the forum.
I'd tend to agree with this sentiment.
Minor,
Most run DRW because we tow heavy, everything about RV'ing is a compromise. You can't always have it all-ways.
No idea what you're towing but, happy motoring you'll enjoy the new truck.
__________________
J & J, DRV Suites ES-38RSSA #9679 GM Denali, 3500HD-Max, 4x CC, 8' DRW,
EZGo-TXT, Clubcar Precedent
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05-02-2017, 06:04 PM
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#11
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Senior Member
Join Date: Aug 2016
Posts: 395
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Quote:
Originally Posted by kotz
The new truck will have the Aisin trans with the 3.73 rear end.
Thanks
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I have the 2016, 6.7, AISIN, 3.73, long bed, crew cab. I get 19 on why with fiver hitch and bed load of stuff. I get 8.5 - 9.5 towing #18k - #19k. Towing mpg depends on speed and hills vs flat.
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05-02-2017, 06:16 PM
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#12
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Senior Member
Join Date: Aug 2016
Location: Harrah, OK
Posts: 367
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I have a 2012 3500 DRW 4wd crewcab/long bed, with a 4.10 rearend.
My truck is not broke in yet, (12,900 miles). The absolute best mpg I have got, so far, is 15 on a all highway trip to Indiana... about 750 miles each way.
My average is usually around 12 - 13 mpg.
Not near as good as my 2004 2500 crewcab/shortbed 4wd, which would get up to 21 on a trip.
I suspect that most of the difference between the two Dodges I have had has more to do with emission controls.
__________________
Troy 
2014 Fleetwood Providence 42P
Cummins 9L ISL 450HP
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05-04-2017, 04:17 AM
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#13
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Senior Member
Join Date: Sep 2012
Posts: 542
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Quote:
Originally Posted by TRebel
I have a 2012 3500 DRW 4wd crewcab/long bed, with a 4.10 rearend.
My truck is not broke in yet, (12,900 miles). The absolute best mpg I have got, so far, is 15 on a all highway trip to Indiana... about 750 miles each way.
My average is usually around 12 - 13 mpg.
Not near as good as my 2004 2500 crewcab/shortbed 4wd, which would get up to 21 on a trip.
I suspect that most of the difference between the two Dodges I have had has more to do with emission controls.
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I believe you are correct. The 2013+ trucks are better on fuel and the emission systems on them are proving to be better all around than the 2007-2012 systems.
__________________
2014 Ram 3500 CCLB 4x4 Dually 68RFE, 370/800 Cummins 3.42 highway gear - Deep Cherry Red
2016 Coachmen Chapparal 360IBL
Sold - 2005 Dodge Ram 2500 SLT QCLB 4x4 - Cummins Power
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