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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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#76 of 506 Re: HELP! New Diesel Owner on MPG [sleadhead44] by 06lly Aug 16, 2005 (2:46 pm)
Replying to: sleadhead44 (Aug 16, 2005 1:13 pm) Well, 4X4 is part of it. More parts, more friction. If the vehicle is new, it will take 3000-4000 miles to get it loosened up a little.   The issue with towing is frontal area more so than weight, especially at those speeds. The horsepower it takes to overcome the drag varies as the cube of mph, so slowing down a little will save a lot. Drag varies linearly with the frontal area and the drag co-efficient so those are two important factors also.
#77 of 506 Fuel mileage by jbhka Aug 17, 2005 (8:56 am)
I just purchased a '05 4x4 crew cab GMC duramax. Previously had same truck('03) but gas. I want to maximize/improve fuel mileage. I've seen AMSOIL lubricants mentioned to improve mileage. What applications work best?
#78 of 506 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [aarongd] by stoneg Aug 27, 2005 (8:03 pm)
Replying to: aarongd (Aug 05, 2005 6:55 pm) aarongd, I leveled my 05 Crew Cab D-Max 4x4 by replacing my torsion bar keys as well, and have experienced the same rough ride, expecially when going over a speed bump. It feels as if the front shocks are "topping out" when they are fully extended. Someone said I should replace the stock shocks with a longer Blistien shock. Any ideas? Also, did you notice your mpg go down after you leveled? I am trying to figure out how all these people here are getting such great economy, when I average about 11.5 in the city, 13.5 hwy, and 7.5 pulling a heavy load. It is from the front end not slicing into the wind by being up an additional 2.5 inches, or the 285/75/16 tires? Replies to this message: aarongd (Sep 29, 2005 6:07 pm) stoneg (Oct 02, 2005 5:48 pm) stoneg (Oct 07, 2005 6:25 am) series60 (Oct 07, 2005 6:44 pm) and 2 more...
#79 of 506 Re: HELP! New Diesel Owner on MPG [sleadhead44] by duramasux Sep 05, 2005 (2:16 pm)
Replying to: sleadhead44 (Aug 16, 2005 1:13 pm) I have a 2004 duramax, lly. I was getting 13.5 mpg new, 2 months later dropped to 9-10 mpg. truck quit 3 times in colorado, pulling under 10000 lbs. found bad injector module after 3 trips to dealer. $1000 bill for gm. Same thing happening again. Starts combustion knock, severe, quits but restarts. Contacted GM 8 times to help, customer no service helpful not.
#80 of 506 Re: Not driving a Yota anymore [stoneg] by rogueservices Sep 06, 2005 (1:27 pm)
Replying to: stoneg (Jul 22, 2005 6:49 pm) I Have an 05 2500HD that has had the Edge juice with attitude in it since day two. I'm seeing a big rang in fuel economy. The best I have found with stock tires is running on stage 2 at about 62 MPH. If I hold it there I'll get about 19-20 MPH depending on road terrain. I average better milage with it off if I'm driving around town, about 15-16 MPG. If I dial the Edge juice up to stage 3 and Accelerate hard and drive 75-80 I see about 13 MPG average. My experience has been that no matter what you do slowing down give me the best result. But on stage 5 she goes like a bat out hell!! for about a mile and then the EGT's are pretty high! Stage 4 is fun to drive but run too hot for extended driving over 60 MPH or loaded. In the big picture if your looking for economy buy an economy car. A diesel Truck is meant to pull what nothing else can. I Replies to this message: stoneg (Sep 11, 2005 2:06 pm)
#81 of 506 High Idle by firemedic Sep 07, 2005 (6:15 am)
I have a 04 with the LLY. Has anyone had a problem with the Cold High Idle not working? If I do the pedal pattern in the manual the computer does not recognize me doing anything(I have a plain jane truck with out the steering wheel controls). With the edge and magna flow exhaust I am getting 18 to 19 MPG if I keep the settings on economy and the tach below 2100 or so. When that turbo spools up bye-bye economy.
#82 of 506 Re: Not driving a Yota anymore [rogueservices] by stoneg Sep 11, 2005 (2:06 pm)
Replying to: rogueservices (Sep 06, 2005 1:27 pm) Rogue, Have you replaced the stock exhaust or the air intake? I have been told by a diesel specialist to wait until I had between 5-10k on mine before I did the Edge or the Banks (I'm torn between them), but did say that when I do it, be sure to get a bigger exhaust (4"). I was told by an equal number of people that the cold air intake wouldn't show much of a difference over the K&N filter in the standard air box. So I just added the filter, and I might be getting about 1 mpg better.
#83 of 506 Re: DURAMAX FUEL MILEAGE [blackmax] by fxwg82 Sep 13, 2005 (9:25 pm)
Replying to: blackmax (Sep 19, 2004 1:26 pm) I have a 2005 GMC Sierra, 2500HD crew cab, 4x4 w/ D/max and the mighty Allison trans.. I've owned a new duramax every year since '01. I've loved them all. Even through all the injector problems. I've always gotten 15-20 mpg no matter what I pulled or how I drove. I now get 11 mpg and I try to keep my foot out of it. I've been looking at the new Preditor chip for better economy and power. I see about $500 and it plugs before the turbo and before computor. Anyone have experience with it? Replies to this message: fxwg82 (Sep 13, 2005 9:30 pm) victorycruiser (Sep 19, 2005 9:42 am) roughneck (Sep 19, 2005 12:25 pm) fxwg82 (Sep 20, 2005 8:20 am) stoneg (Sep 25, 2005 5:14 am) and 5 more...
#84 of 506 Re: DURAMAX FUEL MILEAGE [fxwg82] by fxwg82 Sep 13, 2005 (9:30 pm)
Replying to: fxwg82 (Sep 13, 2005 9:25 pm) Oh, I forgot. I put Michlin 285x75x16s on it and the rub in the standard left front wheel well was there. I Jacked the torsion bars a hair as I've done with all my Duramaxes. It works. On this rig I also put removed the muffler and installed a split, dual exhaust w/5" chrome tubes. Replies to this message: victorycruiser (Sep 19, 2005 9:42 am) roughneck (Sep 19, 2005 12:25 pm) fxwg82 (Sep 20, 2005 8:20 am) stoneg (Sep 25, 2005 5:14 am) jayceethe3rd (Oct 25, 2005 9:51 am) and 1 more... beachin (Feb 01, 2006 5:51 pm) and 1 more... fairc67 (Mar 15, 2006 5:12 pm)
#85 of 506 Re: HELP! New Diesel Owner on MPG [sleadhead44] by benr Sep 14, 2005 (3:37 am)
Replying to: sleadhead44 (Aug 16, 2005 1:13 pm) That is Very Low mileage. I have 2003 2500HD Duramax with the 5 speed automatic and tow a Potomac 35 foot 13,400 lb 5th wheel. My wife and I take several trips a year to the mountains and traveling down Rt 81 through Virginia with the cruise control set at 70-72 mph (you have to in Virginia or the big rigs will blow you off the road); I consistently get 15 mpg on the flat country and 12-14 in the Hills. Do you have the Alison 5 speed Automatic Transmission? Are you using the cruise control? If not you could be a gas peddle thumper! Are you using the tow button? The only time I use the two button is when coming down out of the hills to reduce using my breaks - if you always use the tow button it will take 5th gear out of play - that would account for you lousy mileage.   Lastly if all else fails use your warrantee and get GM to check it out. Replies to this message: benr (Sep 16, 2005 6:54 am) sleadhead44 (Sep 30, 2005 5:29 am)

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