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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

511 messages,  Last post on Dec 29, 2009 at 8:41 AM

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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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#502 of 511 Re: Bad mileage on a 2005 [boomd] by vaughninms Nov 28, 2009 (5:16 am)
Replying to: boomd (Jul 02, 2009 8:50 pm) The LLY engine has a design flaw in the turbo inlet mouthpiece. There are several ways to fix this, so you should do your own research. If you want the BY FAR easiest, there is a guy in the Phoenix area that has a kit. Send an e-mail to beekillercox.net and he will be happy to assist. You can also buy the LMZ mouthpiece from GM but you will have to do a little grinding to make it fit. Most folks say they can do that in about an hour (they have all the tools). Your choice. Killerbee (this is his "handle") is an engineer and has documentation on all of his research. HIs kit comes with all hoses, clamps, etc. It is a 15 minute fix. It even includes color pictures. It does not void the warranty, and the parts are warranted against defects for life. The reader's digest version of the problem is that the LLY mouthpiece has a very hard turn and a lot of turbulence is created from this. This heats the air going into the turbo, which heats it more. Result is the clutch fan running much more often sucking HP and causing mileage drops. If you haven't done this already, do your research and replace the mouthpiece using whichever method you choose. Replies to this message: maxxtorque (Dec 28, 2009 10:37 am)
#503 of 511 Re: considering chevy [pistolace] by vaughninms Nov 28, 2009 (5:22 am)
Replying to: pistolace (Apr 13, 2009 5:12 pm) Pushing the arrow button only resets the start point for average driving. You get instantaneous mpg for a second or so. It will level back out over time.
#504 of 511 Re: Synthetics and the Duramax [pescador] by wear04 Nov 28, 2009 (10:59 am)
Replying to: pescador (Jul 07, 2006 8:15 am) Did you do this and if so How is mileage and how many miles on truck now. I have 49k on mine and average 10.5 with reg oil
#505 of 511 Trouble towing by wear04 Nov 28, 2009 (11:02 am)
Have a 2006 2500 duramax when I pull a heavy trailer I get a chucking sensation in 1 and 2nd but seems to go away after that. Any Ideas. Only when towing. At first thought I had maybe bad belt in tires but I replaced with a little more aggressive and it makes worse feel.
#506 of 511 Fuel mileage comparison between chevy and dodge diesels... by stang2007 Nov 30, 2009 (5:21 pm)
I am new to this site and was very interested in purchasing a diesel truck. I have test driven the 09 Dodge 2500, Chevy 2500 and the Ford F250. I only drove the ford because I wanted to compare to the others...(im a chevy guy). There are things that I like about and dislike about all makes. Basically if you had a chevy with a cummins engine and an exhaust brake with power folding and telescoping mirrors, you'd have the perfect truck. But thats not an option, so I was looking for someone to give me a little insight about them. And I am concerned about fuel mileage...again Chevy has the 26 gallon (short bed), and the Dodge has like a 34 gallon on it.   Can anyone tell me what they are getting loaded and unloaded.....just curious.   Thanks Replies to this message: catam (Dec 11, 2009 9:03 pm) stang2007 (Dec 11, 2009 9:33 pm) coontie66 (Dec 12, 2009 5:15 am)
#507 of 511 Re: Fuel mileage comparison between chevy and dodge diesels... [stang2007] by catam Dec 11, 2009 (9:03 pm)
Replying to: stang2007 (Nov 30, 2009 5:21 pm) I have an 09 2500 CC 4wd LT Duramax/ Allison   My current mileage stats are as follows: Total vehicle miles 6654 Cummulative average 15.38 Best tank 19.80 Worst tank 10.29 Last tank 17.73   I tow a triple set up with my boat and a pop up trailer, total towed weight ~ 8500#   I bought my truck the first week of June this year and used it all summer towing. My average towing is between 11-12 MPG depending on driving speed and terrain (I live in Utah so lots of mountains). My average when commuting, mostly hwy is 18mpg. I haven't done a road trip without towing so can't tell you what that would be. I'd guess right about 20. Replies to this message: stang2007 (Dec 11, 2009 9:33 pm) coontie66 (Dec 12, 2009 5:15 am)
#508 of 511 Re: Fuel mileage comparison between chevy and dodge diesels... [catam] by stang2007 Dec 11, 2009 (9:33 pm)
Replying to: catam (Dec 11, 2009 9:03 pm) Thanks...
#509 of 511 Re: Fuel mileage comparison between chevy and dodge diesels... [catam] by coontie66 Dec 12, 2009 (5:15 am)
Replying to: catam (Dec 11, 2009 9:03 pm) That's about what I get with my 06. I have a camper I pull which weighs about 12,000 lbs and I get 11 +/- . With my 3000lb boat only I get 15 or so.
#510 of 511 Re: Bad mileage on a 2005 [vaughninms] by maxxtorque Dec 28, 2009 (10:37 am)
Replying to: vaughninms (Nov 28, 2009 5:16 am) There is a detailed article by Michael Patton about the LLY shortcomings and his solution here (http://bit.ly/6vzwAU).
#511 of 511 Transmission line issues by wantmydodge Dec 29, 2009 (8:41 am)
Has anyone had to replace the transmission lines in a Chevy Silverado? I have an 07, 2500 HD. I have heard that this is an on-going problem and after spending $$ to have this fixed, that it could very well happen again.

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