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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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#51 of 506 by Sylvia STAFF Jul 05, 2005 (12:21 pm)
A reporter would like to interview diesel passenger car and pick-up owners and Southern California residents who'd like to buy a diesel passenger car but can't because new ones aren't sold in California. Please respond to jfallonedmunds.com by Thursday, July 14, 2005 with your daytime contact info, vehicle year/make/model and city/state of residence, and put the word “diesel” in the subject line.
#52 of 506 Re: 2005 Duramax Fuel Mileage [gemini5362] by unklal Jul 08, 2005 (5:36 am)
Replying to: gemini5362 (May 09, 2005 5:29 pm) Just joined the forum, and I am getting exacly the same miles. Get about 10-12 pulling a 6200lb camper and right now back and forth to work is averaging about 17-18MPG. I was also told that after the engine broke in that it would do better for mileage. Had I know the mileage was going to be like this, probably would have purchased a gas engine for a chepaer price and cheaper price at the pump.
#53 of 506 Re: Love the D-Max [mnichols] by gemini5362 Jul 11, 2005 (5:28 pm)
Replying to: mnichols (Jun 17, 2005 6:02 pm) Now that I have almost 3500 miles on my truck I am seeing between 16 and 17 but that is running at 75 to 80 miles an hour unloaded. I am very happy with my duramax the truck is fun to drive. I do have one other question about the truck. at 80+ miles per hour when driveing on a toll road in Oklahoma the truck seems to be very bouncy almost like the concrete divider sections of the road hit a resonant frequency for the springs. My brother in law who has an older duramax said his road badly till he went to a bigger tire (285x 16) mine rides fine on regular state paved highways it is just on the toll road I seem to notice this. At 75 mph (which I know is the speed limit the truck just likes to go faster than that) the vibration dies away to where it is almost not noticeable has anyone else had this problem.
#54 of 506 Love my 2003 DM 2500 HD 4x4 Crew Cab by opmech Jul 11, 2005 (8:58 pm)
I am getting 19-21 MPG 75-80 mph on the HW w camper shell and about 1/4 ton of gear. That is in mountains or out. I have almost 30K miles on it. Only had minor issues typical of GM, mostly fit & finish (trim, etc). Loaded and towing a 5,000 lb Travel Trailer it gets 10-15 mpg depending on terrain. Typically 10 mpg when driving from 1000 ft. elevation to 6,500 ft elevation. This is running 65-75 mph also (even up the mountains). In town I don't get less than 15 and usually get closer to 16mpg. Also, not meant to be a plug, but I have installed AMSOIL in place of all factory lubricants in the drive train. Also use the AMSOIL fuel additives and dual remote by-pass filtration unit along with the two-stage air filter.   Don't hammer me because I am telling you this, I don't care one way or the other what you guys get or what oil you use, just letting you know what is possible and what I did to achieve it. It isn't cheap to use these lubricants and filters but they do help with the fuel economy. If you would like more info, shoot me an email daveazoil.com.   If anyone has any input or experience raising these trucks without the addition of a lift kit please let me know as well. Thanks, Dave. Replies to this message: stoneg (Jul 20, 2005 5:33 pm) opmech (Jul 20, 2005 8:37 pm) stoneg (Jul 22, 2005 6:14 am) stoneg (Jul 22, 2005 6:18 am) and 1 more... pescador (Jul 26, 2005 11:39 am) cinness (Mar 24, 2007 8:27 am) aarongd (Aug 05, 2005 6:55 pm) stoneg (Aug 27, 2005 8:03 pm) aarongd (Sep 29, 2005 6:07 pm) and 5 more...
#55 of 506 Towing Mileage by tr4wh Jul 12, 2005 (6:03 pm)
I just towed our fifth wheel with the 2500HD Duramax/Allison/4 x 4 truck. Overall average was about 10 mpg, mostly flat highway towing. Regarding the Allison, I find it rather strange that it stays in 4th gear up to 65mph, the rpm level finally forces the shift around 3000rpm. This is in tow/haul mode. I did notice a drop off in uphill speed, it dropped of more than I thought. It reminded me of my 2500 Ram with a Cummins. Does this seem normal or are there some issues? The truck is a 2002 model with 45k on it.   P.S Typical mileage empty is about 17mpg.
#58 of 506 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [opmech] by stoneg Jul 20, 2005 (5:33 pm)
Replying to: opmech (Jul 11, 2005 8:58 pm) Dave, I have had my 05 2500hd crew cab std bed 4x4 Duramax for 11 days now, and have switched out the pizza cutter 245/75/16's with BF Goodrich AT TA KO 285/75/16 which added about 2.5 inches. Also I added a leveling kit that lifted the front end up 2.5 inches, so that the top of the front wheel well matched the height of the rear. Overall the front has come up 5 inches, and the rear 2.5. It looks great! I did have to trim a very small amount of the front valence to keep tires from rubbing. Now that I have done that I am very happy. I have a friend with the exact same truck who put 295's on w/o the leveling kit, and he said his rub. Now that I have trimmed the front, I wished I had gone with the 305 or 315's because they are a little taller, and almost a full inch wider. FYI, the leveling kit was $275 installed.   I would like to hear some comments on some of these "programmers" or "chips" for the new 6.6 Duramax LLY (LLY = 8th digit in Vin is a "2"). I am not towing/hauling anything (except my own ass) and wondered if is worth the $400-$900? I am mainly concerened with increasing my fuel economy, but wouldn't be bothered with a little faster "off the line" reaction. I am concerened that I would need to worry about Exhaust Gas Temperatures, switching out exhaust systems to a wider diameter, installing a cold air intake system, digital in the cab monitors etc. Thanks in advance.   Stone G Replies to this message: opmech (Jul 20, 2005 8:37 pm) stoneg (Jul 22, 2005 6:14 am) stoneg (Jul 22, 2005 6:18 am) opmech (Jul 22, 2005 7:21 pm) pescador (Jul 26, 2005 11:39 am) cinness (Mar 24, 2007 8:27 am)
#59 of 506 Re: DURAMAX maxed out [maxie05] by stoneg Jul 20, 2005 (5:37 pm)
Replying to: maxie05 (Jun 15, 2005 6:18 am) Maxie05, did you change tires to a larger size? If so, did you re-calibrate the tire size in the computer? If you didnt re-calibrate, your truck is registering fewer miles on it that you are actually going, therefore decreasing the number of miles per gallon.
#60 of 506 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [stoneg] by opmech Jul 20, 2005 (8:37 pm)
Replying to: stoneg (Jul 20, 2005 5:33 pm) Stone,   Thanks for the info. What kind of leveling kit did you use? That sounds like a great price installed. Also, if you will send me a personal email I will send you contact info for one of my AMSOIL accounts that markets a programmer. I use it in my 2003 and I am happy with the results. I believe he will take care of you on the price as well.   Dave Replies to this message: stoneg (Jul 22, 2005 6:14 am) stoneg (Jul 22, 2005 6:18 am) opmech (Jul 22, 2005 7:21 pm) pescador (Jul 26, 2005 11:39 am)

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