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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

506 messages,  Last post on Nov 30, 2009 at 5:21 PM

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What is this discussion about? Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, GMC Sierra 2500HD, GMC Sierra 3500, Diesel, Fuel Efficiency (MPG), Truck

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#174 of 506 Dually mileage by davet3 Feb 03, 2006 (3:57 pm)
I'm very seriously considering a 3500 dually duramax with the intention of putting a truck camper on it. Can I expect a dually will get worse mileage than on a 2500 or 3500 with single rear wheels? Anyone have some data on the dually with the newer Duramax?
#175 of 506 Re: coadman [catam] by coadman Feb 03, 2006 (6:05 pm)
Replying to: catam (Feb 03, 2006 1:09 pm) let me see if i get this straight you said the only transmission that comes with the duramax is the alison correct? I have been looking at some on ebay and have found some that say they are just a automatic 4 speed and then others have say they are alison automatic 5 speed. Are they both the same thing or different??
#176 of 506 Coadman by catam Feb 06, 2006 (1:25 pm)
To the best of my knowledge, all Dmax's sold in the US in the light duty trucks had only 2 tranny choices, the Allison auto (5 speed til 05, or 6 speed in 06), or the 6 speed manual. GM's 4L80e 4 speed auto tranny has never been available on the Dmax. It was not designed for >500 ft.lbs of torque. The 4L80e is available as an auto tranny option for the 8.1L gasser, as well as the Alison and the 6 speed manual. If someone tells you different, I would ask for some documented proof. Also, I personally wouldn't trust the 4L80e behind a Dmax. (It's a great tranny, I have one in my 96 Suburban, but its not designed for that kind of power.) Replies to this message: coadman (Feb 06, 2006 2:08 pm)
#177 of 506 Re: Coadman [catam] by coadman Feb 06, 2006 (2:08 pm)
Replying to: catam (Feb 06, 2006 1:25 pm) This is what ive been looking at on ebay. Did the seller just make a mistake saying that it is a 4 speed? http://cgi.ebay.com/ebaymotors/2003-Chevy-2500HD-Duramax-Diesel-4x4-Extended-Cab- -LS-CD_W0QQitemZ4608501601QQcategoryZ90969QQrdZ1QQcmdZViewItem
#178 of 506 Buying another by spademan Feb 11, 2006 (7:38 am)
I don't know if anybody comes in and reads these anymore or not, but I need some advice. I'm going to buy another truck for the farm, and I'm not sure which version of the duramax is the best. I have an 01 and love it, but should I get the LLY in stead??
#179 of 506 duramax warranty by frustrated9 Feb 12, 2006 (4:35 pm)
just bought 06 duramax,any problems with warranty with GM ,when doing own oil & filter changes your self ?
#180 of 506 Chips by spademan Feb 19, 2006 (5:55 pm)
Has anyone added a ship to their truck??? If so, has it helped the mileage, and how much?? Replies to this message: spademan (Feb 20, 2006 10:02 am)
#181 of 506 Re: Chips [spademan] by spademan Feb 20, 2006 (10:02 am)
Replying to: spademan (Feb 19, 2006 5:55 pm) I think we all know i meant to type chip...has anyone added a chip to their truck.
#182 of 506 Superchip by red454 Mar 05, 2006 (6:33 pm)
How are the superchips? Are they worth it. Can you tell a difference in feul economy and power? Pleas help Replies to this message: dddt (Mar 01, 2007 8:49 pm) dddt (Mar 02, 2007 1:25 pm)
#183 of 506 Fuel MPG and 2006 DuraMax HD CC SB Ali 6sp by frankoduramax Mar 12, 2006 (6:28 pm)
I see many posts. Here is my experience. I have a 2006(non 350 hp motor) with a Afe high flow filter and a BullyDog programmer. After adjusting for 265-75 16 tire upgrade, I am getting a 3 TANK AVERAGE of 16.5MPG combined...and I jump on it once in awhile, too:). I have it on the lowest power programmer, and it runs hard(347HP and 740 Torque) I have had ZERO problems, and pulling my 16ft Pace trailer with 3 ATV's and all gear(about 2000lbs trailer and 200lbs vehicles/gear/fuel), it gets 14.5 MPG 55 MPH. I am here in So Cal, and that might help. I do use a cetane booster..seems to almost have zero smoke and runs smoother. FHI Franko

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