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Old 03-13-2013, 07:50 PM   #51
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What is your mpg

2012 Chevrolet 3500 dually pulling 16,000 + fiver getting 11.5 to 12 mpg between 65 and 70 mph. Truck has only 7500 mi so I hope to get slightly better once it breaks in but I dont expect much.

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Old 03-13-2013, 08:25 PM   #52
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I have a 2011 GMC Duramax 4 door 2wd with 90000 miles on it. I average 16 mpg empty and with my Roo 23ss it averages 15.2. The thing I hate the most is having to add Def once a month.

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Old 03-13-2013, 08:29 PM   #53
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I have a 2011 Chevy Silverado with the Duramax/Allison combo. I pull a 2011 Carriage Cameo with a sticker that puts the GVW at 15,999. I have never had the rig on the scales. I usually tow at 60 to 65 MPH and like Herk said there are many factors that affect the MPG. I have been as high as 12.0 and lows around 9.5.

There are tuners out there for the Duramax that claim to increase the fuel mileage. I use a small automotive shop ran by a father/son for general maintenance, oil changes and rotation. His son was into the diesel thing with the big stacks, tuning and turbos. He told me to leave the Duramax alone. Most everyone that had messed with their Duramax had hurt them in some manner.
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Old 03-13-2013, 09:14 PM   #54
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2011 2500HD with LML. I average 10.5 towing 13K fifth wheel. I average 20 on highway unloaded, but have gotten 22 mpg on a trip up to St. Louis. Daily driving to work is around 17mpg.
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2013 Palomino Sabre 34 TBOK
2011 Chevrolet Silverado 2500HD SRW CrewCab SB
B&W Companion
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Old 03-13-2013, 09:46 PM   #55
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08 lmm duramax, 2wd ccsb winter mpg hand calc avg 15.6 around town. i usually avg 20 not towing on hiway, wife has coaxed 24 out of it, but not very often. towing i recall last yr was about about 11 with a 5er i have no idea what it weighs. we travel "light" tho. we only have 35000 on odometer, so im hoping it will get a little better when it gets broken in.
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Old 03-14-2013, 10:13 AM   #56
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Originally Posted by jwwilson View Post

He told me to leave the Duramax alone. Most everyone that had messed with their Duramax had hurt them in some manner.
He must not know the 6.6 then because I know hundreds of guys that will say otherwise, including me and I am heavy modified.
2012 Wildcat 344QB

06 LBZ ,CC 4x
lots of mods
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Old 03-14-2013, 10:20 AM   #57
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Reminds me of taking weight-loss pills; they take the weight off and the folks selling them don't care that they sometimes shorten you life by 10 years.
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Old 03-21-2013, 05:44 AM   #58
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Got 12 mpg taking the 7600 lb trade to the dlr @ 62 mph
2005 GMC Sierra 3500 SLT DRW 6.6 D/A
2013 Crusader 335BHS TE
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Old 03-21-2013, 06:53 AM   #59
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Math for us

We bought a 2011 new Siverado 6.0 w gas was almost a dollar a gallon cheaper and no $500 service to a diesel required....we get 10-11 mpg pulling 8500 lb 5 er.... get 18 mpg driving without trailer as long as can stay in 6th gear.....otherwise 15-16 mpg....truck is crew cab with 8 ft bed and always have stuff in back seat area and bed....truck is used mostly for towing....either 5 er or haulmark trailer....and we pull 56-58 mph to get the mileage and travel without trailer at 55-60 long as you are towing less than 10k I think the gas is is for us and a lot cheaper....purchase difference was around 13k and service is alot cheaper...
Towing mileage is more than 50% or total we use for towing..

2011 Silverado 2500HD 6.0 Gas 3.73
2013 Flagstaff 8524 RLWS
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Old 03-21-2013, 05:42 PM   #60
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Originally Posted by puff View Post
As already stated speed and road conditions are the MPG killers. I don't have a duramax but have a GMC with a 6.5 Turbo diesel. Towing my 14k girl she gets 10-12 maybe more depending, maybe less. I have figured out that I am not going to get there first or to the top of the hill before grandma n grandpa on a sunday afternoon drive.

It's the adventure and the drive not the speed at which I arrive. If I want speed I hop on the bike.
Thats about what I get with my 6.5, Mine is quite modified and pulls as good or better than my 2003 DMax, You can really wake those up with a few tricks and a couple $$

2009 Sabre Palomino "Sissy"
1998 Chevrolet K3500 6.5 Diesel "Brutus"
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