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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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#448 of 506 Re: [losman54] by jbull454GMC Jan 26, 2009 (10:21 am)
Replying to: losman54 (Jan 26, 2009 6:56 am) They have extended the warranty on the injectors. You will need to get with your dealership on that. If there is a hassle I would concider calling either Chevrolet or GMC customer assistance depending on what you have.
#449 of 506 by MichiganMax Feb 19, 2009 (3:56 pm)
I run Amsoil 15-40 In a 2002 Duramax CCSB in Michigan and it runs great, although I do run PowerService with every tank, and plug it in when it gets down around 5 or less, just so it will start up easier and always let it warm up 10-20 minutes. Even when I havn't had it plugged in it will still start great down to atleast -15...thats the coldest I've had to start it. It's not only the oil that Amsoil has that is outstanding, but their oil filters filter small particles than others which keeps your engine cleaner from dirt or whatever else makes it's way in there. It basically makes an engine perform better for longer. Replies to this message: jbull454GMC (Feb 19, 2009 6:46 pm)
#450 of 506 Re: [MichiganMax] by jbull454GMC Feb 19, 2009 (6:46 pm)
Replying to: MichiganMax (Feb 19, 2009 3:56 pm) Thanks for the info. My GMC is almost broken in enough I can begin running Amsoil. I currantly use it in my gas vehicles and I must say, I'm very impressed. As a tip for those who have portable generators also: Running a good synthetic oil such as Amsoil will up the loaded running time 20-50% I have found. I let my Duramax warm up 10 to 20 minutes also. It has a factory remote start that lets it run 10 minutes so that makes it easy for me. I am looking forward to running Amsoil in my Duramax just to see how the milage improves too. Thanks again and take care!
#451 of 506 Re: 08 duramax mpg [jtoc] by wvgrumpfish Mar 21, 2009 (11:11 am)
Replying to: jtoc (Jun 08, 2008 4:23 pm) I just bought a 08' LTZ 4X4 Duramax/Allison and I have got 19 mpg on the highway . Yes they have choked the exhaust down and it is not removable except the muffler. My 2001 had just a muffler and I never got below 20mpg's but it was manual shift. If you are interested in my truck it is 4 sale . The judge gave the X the camper so I don't need a diesel now . I have to down size. My e-mail is jccordcomcast.net and I can deliver some what .    Jim
#452 of 506 GMC Topkick 4500 by losman54 Mar 21, 2009 (2:07 pm)
I got a new 2007GMC TopKick 4500 pickup body left over this last Dec. customized by Monroe Truck Equipment with all of the works. I drove it it back a 1,0000 and got 15-16 HWY MPG not hooked up to anything. I just put Amsoil new product for 2007 plus Duramax. Let's see if it improves my MPG.
#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!

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