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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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#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)
#86 of 506 Re: HELP! New Diesel Owner on MPG [benr] by benr Sep 16, 2005 (6:54 am)
Replying to: benr (Sep 14, 2005 3:37 am) Forgot to mention my 03 is a crew cab short box.   and what is all this about injector problems? when does this happen? I'm headed to this hills this afternoon and will roll over 30K miles this trip please don't tell me I have something bad to look forward too. Also when not towing my milage holds 18-21MPG to and from work and around town in the meto area of DC.   also a news flash that I just came accros this morning - here I'll paste it: ********************************* New August 25th: GM has announced a voluntary customer satisfaction program (#05546) for current owners of Duramax diesel equipped vehicles. In a letter dated August 2005, current registered owners were informed that they are eligible for one free fuel filter replacement, and GM has instructed their dealer network to perform this service free of charge through September 30, 2006. Please contact your local dealer to learn more about this free offer, or call 1-888-996-9463 if you need more information. ********************************   Think I'll take advantage of this one, I'll need an oil change when I get back anyway.
#87 of 506 Re: DURAMAX FUEL MILEAGE [fxwg82] by victorycruiser Sep 19, 2005 (9:42 am)
Replying to: fxwg82 (Sep 13, 2005 9:30 pm) I am getting a set of 285/75/16's put on this Friday. What do I need to do to dial up the Torsion bar? Also I am told I will need to get the dealer to calibrate the speedo. Is this correct?   I would love any help I can get here. I just don't like the look of the 245's. Also was always getting stuck in the back yard if it rained. Figured that the wider tire may make the truck "float" a little better in the mud.   Any help is appreciated.   VictoryCruiser Replies to this message: 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) stoneg (Nov 06, 2005 6:15 pm) beachin (Feb 01, 2006 5:51 pm) clow123 (Feb 02, 2006 9:14 am) fairc67 (Mar 15, 2006 5:12 pm)
#88 of 506 Re: DURAMAX FUEL MILEAGE [victorycruiser] by roughneck Sep 19, 2005 (12:25 pm)
Replying to: victorycruiser (Sep 19, 2005 9:42 am) victorycruiser   When I put on the 285's I found my speedo was off about 5 mph. I went to the dealer to recalibrate my speedometer and the dealership told me that Chevy will not recalibrate the speedo on duramax trucks. Stupid huh? But I seen a recalibration chip by superlift for about $190. In case your tire shop doesn't tell you you need to get an alignment after raising the torsion bars.
#89 of 506 Re: DURAMAX FUEL MILEAGE [victorycruiser] by fxwg82 Sep 20, 2005 (8:20 am)
Replying to: victorycruiser (Sep 19, 2005 9:42 am) The 285s will definitly fill the wheel wells better and make the truck look better. Everytime I've put 285s on one of my duramaxes, the right front will rub. If ya put splash gaurds on it's worse. By raising the front end with torsion bars is easy to do by reputable alighnment shop and a slight alighnment is needed. It will also rais the front end, leveling the truck. As for the speedometer: A difference of 2-3 mph faster than it shows. Not a big deal for me and I've never worried about it or inquired about an adjustment.

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