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Old 08-02-2015, 01:40 PM   #15
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1966 24' Tradewind
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Duramax V8 engine - Wikipedia, the free encyclopedia


The Duramax is a General Motors diesel engine family for light-and medium duty trucks, designed by GM and Isuzu. The 6.6-liter Duramax is produced by DMAX ...‎Engine RPO Codes - ‎See also - ‎References - ‎External links

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Old 08-02-2015, 01:49 PM   #16
Ernie & Madaline #3570
2010 30' Classic
Westford , Massachusetts
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Our 2500HD Duramax short bed crew cab with 50 gal aux tank in bed (86 total) is a 2011 with full storage in bed (ARE CAP) pulling Classic 30 @about 9000 lbs. there are 74000 miles, broke in at 53K. Towing ranges between 13.5 over Rockies, 15.2 in Kansas/Nebraska. No trailer run from Mount Airy, Nc to Boston we saw 21. The best part is engine performance and integrated trailer break control with exhaust break, an amazing truck to tow with, cruise control is great.

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Old 08-02-2015, 03:27 PM   #17
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2010 25' FB Flying Cloud
1964 17' Bambi II
Laramie , Wyoming
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Originally Posted by Jack46 View Post
We bought a 2012 2500HD Duramax crew cab with an ARE cap in January at 59,000 miles. It now has about 73,000. Our experience on a recent 11,000 mile trip through the Southwest, CA, OR, and return overall was between 13-14 mph hauling our 30' FC and a load in the truck. Have not yet done a long trip not hauling but in checking from time to time I would guess 17-18 mph.
Same here on our '05.
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Old 08-02-2015, 03:35 PM   #18
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2005 25' Safari
Argyle , Texas
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He is about right - depends on the terrain. We have owned a 2002 GMC since it came off the line. Have had absolutely no problems. Has over 100,000 miles and have no intention to replace it. Pull every kind of trailer with it, travel trailer, heavy goose-neck horse trailer w/living quarters, a long goose - neck utility trailer - loaded. Doesn't make it any difference as to weight behind it. Good luck.
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Old 08-02-2015, 03:59 PM   #19
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1999 34' Excella
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Hillsboro , Texas
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2012 4x4, Dmax, Crewcab short box.

It just rawks..... 11-12 'city'... 10-11 towing 34'AS...23-25 running light, no AS, nothing in the bed (60-65MPH). Bump up to 75MPH and you hit lower... 17-18MPG.

I have had 2 failed injectors under warranty, Both 'original' batteries in the first year, replaced (not under warranty) set of Goodyear 20" stock tires...upgraded to Michelins..

I replaced all fluids at about 38k miles... and it just runs great...
Peace and Blessings..
WBCCI# 30676
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Old 08-02-2015, 04:10 PM   #20
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1973 31' Sovereign
2017 27' International
Raleigh , North Carolina
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We have a 2009 2500 HD with 78K miles. Mileage: 20-21 on road empty, 13-15 pulling 31' '73 Sovereign that weighs approx. 6700 lbs. Bought truck new and have been very happy.
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Old 08-02-2015, 04:13 PM   #21
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1990 29' Excella
olympia , Washington
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We have a 2013 2500HD GMC and get 19 to 20 mpg no matter what I do. Towing our 29' ex cella or not.
Heather and Kyle

Hitting the high road to adventure in two years!
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Old 08-02-2015, 05:57 PM   #22
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1975 31' Sovereign
West Liberty , Kentucky
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I have a 2010 Duramax short bed, crew cab with camper top. It will get 18-19mpg empty and 12-14 mpg towing our 1975 31' AS. Strangely enough,my 2002 Duramax, extended cab with camper top got up to 24mpg empty but got about the same as the 2010 pulling the same trailer.
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Old 08-02-2015, 10:49 PM   #23
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2012 28' International
Bremerton , Washington
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I have a 2011 GMC Denali 2500 with the LML Duramax, 6 1/2' standard bed 4x4. I pull a 28' international serenity. Empty on the highway 20-22mpg, in town 13-18 mpg and with the Airstream 13-14 mpg. Our last long trip was from Washington state to Orlando Florida and back. Our average was 13.9mpg. As for DEF, I use about 5 gal every 5000-7500 miles.
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Old 08-02-2015, 10:59 PM   #24
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1984 31' Excella
Abernathy , Texas
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2002 Duramax. 307K miles.
New transfer case at 285K, new Allison at 285K, New left front axle at 285K and rebuild front diff at 285K due to spun bearing from axle damaging two spider gears.
New injectors at 288K.
So, I pert near have a new truck.
Compression check of all cylinders at injector replacement showed all within 10 lbs of new motors.
Diesel tech said this looked like it could go 1million miles based on current condition at 288K.
I get 16.8 mixed driving in Lubbock Tx and back home 20 miles north on the interstate to Abernathy at 75-80 mph.
I get 21-23 solo all highway at 70 mph or less and mileage suffers above 70 down to 18 mpg.
I get 11-13 towing 31 ft Airstream Excella 1984 model 8450 GVWR at 65-70, and as high as 14 at 60mph.

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Old 08-03-2015, 06:46 AM   #25
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2013 30' Classic
Greenwood , Mississippi
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consistent 12-13 mpg-
not enough miles yet to be concerned about repairs-
get the truck and enjoy it.
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
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Old 08-03-2015, 07:51 AM   #26
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2015 23' International
Holts Summit , Missouri
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23 foot international pulled with a 2015 duramax. 800 miles this weekend. 14.5 MPG PULLING. Otherwise I average 19-20 going down the highway. Very happy with power and mileage.
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Old 08-03-2015, 09:38 AM   #27
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2004 28' Classic
Austin , Texas
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My 2013 GMC 2500HD with 4WD gets around 14-15 mpg around town, roughly 20 mpg on highway and 10-12 mpg pulling a 7,000 lb trailer (28' Classic).
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Old 08-03-2015, 11:14 AM   #28
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z , North Carolina
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Thanks everyone. It just makes sense to get the diesel. Especially if you're going to keep your truck for a long period of time, and consistently tow a large amount of weight.
I appreciate everyones input.
Sea ya down the road!

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