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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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#492 of 506 Economy by donnieray Nov 11, 2009 (5:30 am)
Well, the dealer could not determine what was wrong; in fact in talking to other Duramax owners (2007-2009) I was told that my 10mpg pulling a trailer and the 15hwy mpg was normal.   I painted that bright red Chevy 2500HD Duramax the prettiest shade of "gone" you have ever seen. I have now officially sworn off of "Government Motors" and chalked this experience up to stupidity on my part.   The Tundra is doing just fine. Replies to this message: coontie66 (Nov 11, 2009 7:48 am) donnieray (Nov 11, 2009 1:27 pm)
#493 of 506 Re: Economy [donnieray] by coontie66 Nov 11, 2009 (7:48 am)
Replying to: donnieray (Nov 11, 2009 5:30 am) Lets get together and see if the TOY truck can pull my camper up a 7 % grade for 10 miles. Replies to this message: donnieray (Nov 11, 2009 1:27 pm)
#494 of 506 TIres changed something by coontie66 Nov 11, 2009 (7:52 am)
Two weeks ago I put new tires on my 06 Duramax. It appears that the new tires dropped the mileage 2mpg on the road. I now get 17.8 and it was over 20mpg. HUMMM ... I will change the air filter and check it again.   Both the same size tire. The new tires are a bit more aggressive but still not true mud and snow tires. I wasn't expecting that.   Made in USA but not a name I can remember now like Firestone, Goodyear etc. Its raining outside or I would go look. 3" + and counting.
#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.

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