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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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#453 of 506 Mileage on new 2008 gmc 2500 by risky Mar 26, 2009 (3:34 pm)
I just got a 2008 gmc duramax 2500 in dec, and just towed my bike trailer with 4 bikes and got 11.3 mpg avg for the trip down and back from MN To FL . When im not pulling anything i get about 16-19 mpg. but it is still cold out and when it warms up im hoping to get a little better because when i was in Florida and not pulling anything I got about 19-20 at about 75 degrees. I have about 6000 mile on it now and i will be switching to Amsoil 5W 40 for my first oil change. I hope to get a 1 mpg better. Wait and see! Replies to this message: losman54 (Apr 04, 2009 5:46 am)
#454 of 506 Re: considering chevy [jbull454GMC] by robhen1 Apr 03, 2009 (7:26 pm)
Replying to: jbull454GMC (Jan 25, 2009 5:29 pm) I have a 2007.5 at 6000 miles I drove from texas to florida at 75mph I got 20mpg but at 16000 it dropped now at 32000 I'm down to 13.5-14.5 mpg. Is there a fix for this. at this rate of decline I'll have to park it. Chev dealer said there is nothing they can do. Replies to this message: madbrit427 (Apr 04, 2009 12:52 am) pistolace (Apr 13, 2009 5:12 pm) vaughninms (Nov 28, 2009 5:22 am)
#455 of 506 Re: considering chevy by madbrit427 Apr 04, 2009 (12:52 am)
Replying to: robhen1 (Apr 03, 2009 7:26 pm) I bought my 2500HD Duramax 4x4 in July 2004 brand new. According to the computer, it averages 15.9mpg from the day I bought it, never much varies more than a few decimal points either way. Doesn't seem to care whether I am driving in town, or at 70+mph on the freeways, towing a car hauler or empty, still does about the same economy. I live in rural high desert Arizona with longer trips with less traffic than many city dewellers, but with plenty of big hills. Never seen some of these amazing mpg figures that get posted on the internet. Replies to this message: pistolace (Apr 13, 2009 5:12 pm) vaughninms (Nov 28, 2009 5:22 am)
#456 of 506 Re: Mileage on new 2008 gmc 2500 [risky] by losman54 Apr 04, 2009 (5:46 am)
Replying to: risky (Mar 26, 2009 3:34 pm) your right the difference in air mass is going to make a difference. I would try to get a K &N air filter (I don't any stock in the company, but I found it to make a difference). Also I would try to get a "AeroShield Wind Deflector" or a regular air deflector. Keeping it under 65 MPH will help. I just started putting Amsoil 5-40 too in my GMC topkick which has 10,000 on it...right now I'm not seeing any noticeable difference. Good Luck
#457 of 506 Duramax fuel economy by jbull454GMC Apr 04, 2009 (6:02 am)
I see we are getting some info on this. Thanks to everyone, Its all very helpful, and mostly dicouraging. The federal government has slapped us in the face once again...It was their idea for the DPF. I'm now doing trying which fuels from which company do better on milage. Walmart, which was the cheapest, got me an average of 15mpg but most of my driving has been start stop. I'm trying BP now. It seems to be doing better with mid 16's on mpg. It also seems to have a bit more power. I've also tried Miejer's standard fuel and biodiesel. Standard was same as Walmart. With Bio it got worse milage, but the milage seemed better than its normal milage after the standard diesel was in the tank again. I know that biodiesel does have better cleaning properties and they say you need to change your filter more often. I think when its time to change the filter I will run a full tank of bio through first. The down fall of my test is that I live in Ohio. We have no fuel testing laws, so we end up with the literal crap from the tanks. So I will see what happens with my research and post it all here. Plus when I switch to Amsoil I'll see what happens. Also another friend of mine runs Lucas fuel treatment. He says he sees improvement in his 04 duramax. Cost effective I don't know yet, but after I find out the best fuel to run I'm going to give it a shot. Thanks again averyone and keep the ideas coming for all of us!
#458 of 506 Duramax Injector Problems by kodiak12 Apr 05, 2009 (10:39 am)
Can any one tell me if, since their correction in the 2nd half of 2004, the injector problem that the Duramax had been having has been eliminated or significantly reduced? I"m considering buying a 3500 dually and would like to know how far back I could safely go in model years without an injector problem. Any and all input would be greatly appreciated. Replies to this message: madbrit427 (Apr 05, 2009 2:18 pm)
#459 of 506 Duramax Injector Problems by jbull454GMC Apr 05, 2009 (10:58 am)
I work for a Chevy Dealer. In all of the injector replacements I've seen there have been no more problems, but...I don't think people in this area have put enough miles on them yet either. Although, the Japanese are very particular about things. Isuzu probably informed Bosch to get it right or get lost. I've found out that the Duramax was built to be a million mile engine. So in all actuallity I'd say you were safe in buying as long as the truck isn't abused or anything.
#460 of 506 Re: Duramax Injector Problems [kodiak12] by madbrit427 Apr 05, 2009 (2:18 pm)
Replying to: kodiak12 (Apr 05, 2009 10:39 am) As far as I am aware when the LLY engine with the redesigned heads was introduced was when the main injector problem was cured. That being said, my 2004 LLY engine has had 3 injectors replaced at around 50,000 miles. They blamed it on the injector pump as I also had a rough idle and hunting at slow speeds. Extended warrantys are good, I extended the factory one and will extend it again next year if the option is still available especially as my truck has only just over 52,000 miles on it.
#461 of 506 Re: considering chevy [madbrit427] by pistolace Apr 13, 2009 (5:12 pm)
Replying to: madbrit427 (Apr 04, 2009 12:52 am) ON YOUR DISPLAY WHERE IT SHOWS AVERAGE MPG PRESS THE CLEAR OR ARROW BUTTON AND IT WILL DISPLAY INSTANT MPG. I JUST LEARNED THIS MYSELF Replies to this message: vaughninms (Nov 28, 2009 5:22 am)
#462 of 506 low fuel rail pressure by jodie1614 Apr 26, 2009 (4:43 pm)
I have a 2003 Chevy Silverado 2500HD Duramax with cooking oil conversion that is throwing a low fuel rail pressure code. I push on the gas and it acts like it is out of gas and wont go over 1500 rpms. Replies to this message: madbrit427 (Apr 27, 2009 12:55 am) roland3 (May 07, 2009 7:34 am) unionman1 (Jun 13, 2009 11:34 am)

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