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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

503 messages,  Last post on Nov 28, 2009 at 5:22 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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#489 of 503 07 Silverado Z-71; Lousy Economy by donnieray Oct 09, 2009 (4:58 am)
I pulled a stupid stunt on Labor Day as I traded in a 2006 2500HD with the 6.0L engine. I bought this truck new in 2006 to pull my tractor and my horse trailer. At freeway speeds pulling an empty 24' gooseneck flatbed I would average 9.5 mpg. Without the trailer, I would average 14.5-16 on the highway.   Now to Duramax. It is an 07 Z-71, crew cab. The economy is pathetic. Pulling the empty trailer I get 10.5. At highway speeds with no trailer I can average 15.0. I got that with the gas rig, and the fuel was cheaper. I have thought about buying the programmer, but if it's not going to make a drastic difference I cannot justify the $379 expense.   This was my first diesel; and probably my last if this is the norm. It's not worth it both for fuel economy as well as the cost for service. Replies to this message: artgpo (Oct 09, 2009 6:05 am)
#490 of 503 Re: 07 Silverado Z-71; Lousy Economy [donnieray] by artgpo Oct 09, 2009 (6:05 am)
Replying to: donnieray (Oct 09, 2009 4:58 am) I get close to 20 mpg at 70 mph in my 2009 2500 Duramax. Pulling our 35' 5th wheel I get between 10 - 12 mpg. The truck has under 6,000 miles so I expect the mileage to increase slightly over time.
#491 of 503 Higher Mileage by divebomber Nov 11, 2009 (12:54 am)
I have a manual 2001 Duramax, and I'm surprised to see people here talking about mileage that's lower than mine. I'd say just driving around town I push 20mpg. I've yet to take a long freeway mile trip, but when I've had extensive freeway miles for one tank the mileage might be pushed up as high as 25mpg. (It's nice waiting 10-12 days to fill up the 34 gallon tank.) I bought it used, I can't say if anyone did any work before me, but I don't see anything that seems different. I've had others with similar trucks talk about similar mileage.   I'm surprised to see people talking about 19mpg on the freeway and less around town. I can be quite feather footed, but it couldn't make that much of a difference.
#492 of 503 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 503 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 503 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 503 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 503 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 503 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 503 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

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