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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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#72 of 506 Re: Real MPG numbers [stoneg] by irishfitz Aug 03, 2005 (4:16 pm)
Replying to: stoneg (Aug 03, 2005 12:28 pm) Here is what I have discovered: My 05 DM has about 3500 miles and I was only getting approx 14 mph average (highway & town)...I have found that if I keep the engine between 1800-2200 rpm, I can get from 16-18+ mpg...if I stick my foot in it at stoplights, it drinks diesel in gulps...above 2200 rpm (~75mph) I begin to lose economy quickly...on a long trip, if I keep it at ~60-65 mph (1800-1900 rpm) I can get 17-18 mpg. Replies to this message: 06lly (Aug 16, 2005 9:06 am) jmccormick1 (Sep 22, 2005 2:13 pm)
#73 of 506 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [opmech] by aarongd Aug 05, 2005 (6:55 pm)
Replying to: opmech (Jul 11, 2005 8:58 pm) yes, i have raised my front end to level the back. they replace the original torsion bar stops. i got an extra 3 1/4 in in the front making the front and back exactly the same height. the only problem is that you have to get a new alignment after, and the ride stiffens up a little. other than that, i love the kit. you can buy them for around $75-100. i bought mine on ebay. it takes approx 1 hr to install. and to reference your economy, i believe the 2003 duramax was the older style. mine is the lly . the older ones seem to get significantly better economy. Aarongd Replies to this message: stoneg (Aug 27, 2005 8:03 pm) aarongd (Sep 29, 2005 6:07 pm) stoneg (Oct 02, 2005 5:48 pm) stoneg (Oct 07, 2005 6:25 am) and 3 more...
#74 of 506 Re: Real MPG numbers [irishfitz] by 06lly Aug 16, 2005 (9:06 am)
Replying to: irishfitz (Aug 03, 2005 4:16 pm) I am getting 24 to 25 MPG with my 06 2500HD, 6 speed with LLY at a steady 50 mph. (1300 rpm). Amazing that you can drive something that big and get decent milage too. Replies to this message: jmccormick1 (Sep 22, 2005 2:13 pm)
#75 of 506 HELP! New Diesel Owner on MPG by sleadhead44 Aug 16, 2005 (1:13 pm)
I have a 2005 Silverado 2500 HD 4x4 6.6 Diesel and I purchased it to help save on my towing gas. However I am only getting 6-10 MPG while towing at 65-75 MPH. I tow a Tag hitch 30' enclosed race car trailer triple axle approx 12,000 lbs. loaded, but rated for 15,600 lbs. Can anyone tell me why I am getting such horrible fuel mileage? and please explain to me what "break in" means for a diesel. Thanks! Replies to this message: 06lly (Aug 16, 2005 2:46 pm) duramasux (Sep 05, 2005 2:16 pm) benr (Sep 14, 2005 3:37 am) benr (Sep 16, 2005 6:54 am) sleadhead44 (Sep 30, 2005 5:29 am)
#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.

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