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GMC Sierra 3500 diesel dually MPG

TGR35qba
Explorer
Explorer

‎Jul-13-2018 04:32 PM

I’m thinking about buying a truck and a 20k 5er, and wanted to get an idea of mpg.

If I’m traveling on the highways at 65 mph, do you have an idea on the mpg I might get. I’m hoping others have a similar setup, and might be able to share their experiences.

Thanks in advance
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25 REPLIES 25

Cummins12V98
Explorer III
Explorer III

‎Jul-14-2018 07:41 AM

azdryheat wrote:
I never get better than 9 towing


Nice HONEST answer!
2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
37,800# GCVWR "Towing Beast"

"HeavyWeight" B&W RVK3600

2016 MobileSuites 39TKSB3 highly "Elited" In the stable

2007.5 Mobile Suites 36 SB3 29,000# Combined SOLD
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JTrac
Explorer
Explorer

‎Jul-14-2018 05:57 AM

We towed our 16K trailer with a 15 GMC Dually Denali for 3 1/2 years. We rarely averaged under 10 but never more than 11. We did several 5 to 6K mile trips with it so that was under all kinds of conditions.
JimT
2020 Jayco Pinnacle 32RLTS, 2020 Ford F350, Platinum, 6.7 diesel, 4X4, CCLB, SRW, 12,400 GVWR
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LittleRedGoat
Explorer
Explorer

‎Jul-13-2018 09:14 PM

On our first trip with our new truck we avg 11 mpg overall, towing we were getting 9 to 11 mpg.
2018 Chevy 3500 Duramax DRW, 4wd
2008 Dodge Ram 2500, 6.7l, swb, 4wd(old)
2013 V-Cross 295VRK
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12th_Man_Fan
Explorer
Explorer

‎Jul-13-2018 07:04 PM

I get from 8 to 11 towing 17k 5ER with 2014 GMC DMAX dually crew cab at 65 mph.

If you are worried about fuel milage towing a 20K 5th wheel you might want to reconsider.
2014 GMC Duramax 4X4 DRW Crew

2015 DRV Tradition
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Lantley
Nomad
Nomad

‎Jul-13-2018 06:21 PM

My pre emissions O7 Classic gets 11 towing.
19'Duramax w/hips,12'Open Range,Titan Disc Brake
BD3,RV safepower,22" Blackstone
Ox Bedsaver,RV760 w/BC20,Glow Steps, Enduraplas25,Pedego
BakFlip,RVLock,5500 Onan LP,Prog.50A surge,Hughes autoformer
Porta Bote 8.0 Nissan,Sailun S637
Correct Trax,Splendide
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Halmfamily
Explorer
Explorer

‎Jul-13-2018 05:54 PM

Around 9 or 10 mpg on our 08' DRW Duramax.
2008 GMC Sierra 3500 SLT DRW D/A 4x4 (Big All)
2006 Ford F350 PSD SRW King Ranch 4x4 (Henry) (Sold)
B&W Companion, 90 Aux Fuel Tank, Scan Gauge II, Curt f/m hitch, Swagman XC
2015 Forest River Sierra 360 PDEK
DW Diane, DS Michael, FB Draco and Sabian
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azdryheat
Explorer
Explorer

‎Jul-13-2018 05:09 PM

I never get better than 9 towing
2013 Chevy 3500HD CC dually
2014 Voltage 3600 toy hauler
2019 RZR 1000XP TRE
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dennis1
Explorer
Explorer

‎Jul-13-2018 04:48 PM

Mine 2007 classic before DEF. 23 empty and 13 with 3k truck camper.
My new DRW and camper on the truck the first time.
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N-Trouble
Explorer
Explorer

‎Jul-13-2018 04:46 PM

I’m goimg to say less than 10 pullimg a 20k lb 5er. Also if a newer emissions equipped model there seems to be a lot more variation in MPG from truck to truck even of the same brand.
2015 Attitude 28SAG w/slide
2012 GMC 2500HD SLT Duramax
B&W Turnover w/Andersen Ultimate 5er hitch
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cfuller3
Explorer
Explorer

‎Jul-13-2018 04:46 PM

Touching on 12 if soft footed, but agree that you can count on 10 and be in the ballpark. With some mild breathing mod's and tow chip, I get 23 empty, honest and on plus side, again, soft footed. 2008 3500 Dodge dually.
2008 Ram dually, mildly tuned and some breathing mods. 2008 Grand Junction, two cats and go.
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dave17352
Explorer
Explorer

‎Jul-13-2018 04:37 PM

10 my guess, have owned 4 diesels
NOW 2017 Leprechaun 260ds
2005 Forrest River Cardinal 29rkle FW
1998 Lance 980 11'3" TC
2017 CHEVY 3500 SRW 6.0
B@W turnover ball @ companion Hitch
Honda eu3000 generator mounted on cargo rack
Crestliner 1850 Fish Ski boat mostly fishing now!
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