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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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#495 of 506 My Duramax by myllyduramax Nov 11, 2009 (8:00 am)
I have a 2004 Duramax GMC Sierra one ton dually with an Allison which I bouht new. I pull a 5th wheel that is 12,200 lbs. dry weight and with all our stuff between 13,500-14,000lbs. I have been monitoring the mileage and it get 17.5mpg on the highway and pulling the 5th wheel I get 11.65. I have no after market work done on it except an auxiliary 50 gallon fuel tank from Transfer Flow. Both main and auxiliary tanks are full when I tow the 5th wheel.   People tell me I am getting good mileage and I think I do. I think that size of truck and what is towed has a huge impact on the mileage, as well as, how you drive.
#496 of 506 Re: Economy [coontie66] by donnieray Nov 11, 2009 (1:27 pm)
Replying to: coontie66 (Nov 11, 2009 7:48 am) Well, the truck came from the mountains of New Mexico, and was pulling a fully loaded 20' goose-neck horse trailer with no problems.   At 400hp, I don't think that would be a problem; and I won't have to stop and fill up as often.
#497 of 506 Re: Over heating [rseebo] by riverratt11 Nov 16, 2009 (8:56 am)
Replying to: rseebo (Jun 25, 2006 8:02 pm) Well my friends in message 215 and 207 the problems you are experiencing are not all linked with GM or the Duramax engine your problem would be with banks. You cant just slap a banks 6 gun on a truck and expect performance without problems or strain on the motor. With this added performance you have to add things elsewhere such as cold air intake, transmission upgrades, exhaust upgrades, etc. If you want the performance without the high temps I suggest going to a smaller chip such as a bully dog power pup or a smaller banks chip.
#498 of 506 Re: 07 Duramax [maddogmurf] by chevyrich Nov 22, 2009 (6:29 pm)
Replying to: maddogmurf (Aug 10, 2008 5:37 pm) I was now reading your Aug 10, 2008 posting and was wondering if you have a 2007 classic and was the update under a service bulletin? If so do you know the number of the bulletin?   Thanks
#499 of 506 lionsbay by lionsbay Nov 23, 2009 (10:58 am)
I have a 2002 silverado hd. The fuel gauge will show empty and flash low on fuel and then jump to normal but with wrong fuel gauge reading. Any ideas? Was checked and was told replace tank sensor [cost $1000.] I question the diagnosis. Maybe a bad ground?
#500 of 506 Re: [honda929] by gribman Nov 24, 2009 (10:44 am)
Replying to: honda929 (Jun 02, 2005 7:58 am) I have a 2004 GMC 2500HD and have 285-75 16 on it and no problems. Looks great and only mod was very slight inner plastic trimming so when I turn there is no rub. Highly recommended. My tire guys at a very reputable shop have done this many times and gave me the idea. Replies to this message: jerrydock (Nov 25, 2009 3:30 am)
#501 of 506 Re: [gribman] by jerrydock Nov 25, 2009 (3:30 am)
Replying to: gribman (Nov 24, 2009 10:44 am) I bought my 2005 with over sized tires. They looked good; but they were horrible. I use my truck to travel between my farm and my beach house, a five hour drive. I am finally getting better mileage and a comfortable QUIET ride after replacing the big tires for what the factory called for in a Dunlop 8 ply. You guys who like to "look good" can have all the noisy big crap.
#502 of 506 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.
#503 of 506 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 506 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

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