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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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#23 of 506 04 Duramax anyway to improve mileage? by mcblaze Mar 04, 2005 (6:06 am)
My parents recently bought an 04 Crew Cab Short bed...i think they're averaging 15-17 mpg. We had the 6.5 in a 2wd Suburban. Blew the motor out of it over a mishap with minor service (sad story). Had almost 240,000 on that car. She got around 20. This new one slightly less, not a huge deal. Just lookin for any advice how to increase it. Thanks.
#24 of 506 Re: Diesel truck advice for girls! [chani] by justatrucker Mar 04, 2005 (2:42 pm)
Replying to: chani (Jan 16, 2005 8:34 am) There are (understandably) a lot of variables in getting good mileage. The LLY does its best mileage at 1880 rpm. The 3.42 rear end gets you at the right rpm at 65mph. If you have the 3.71 or 4.1 rear end you would have to drive much slower to be at 1880 rpm. If good gas mileage is important and you are not towing really heavy loads, then make sure you specify the 3.42 rear end for highway driving. (Not exactly sure I have the decimals right for the rear ends Replies to this message: laser2 (May 31, 2005 6:04 pm)
#25 of 506 Re: [blackmax] by trbizwiz Mar 18, 2005 (11:36 pm)
Replying to: blackmax (Sep 25, 2004 3:54 am) IF YOU HAVE AN LLY THE 8TH DIGIT IN THE VIN WILL BE A 2 IF NOT IT WILL BE A 1 ALSO ANOTHER WAY TO TELL IS IF YOU TRUCK WAS BUILT IN THE SECOND HALF OF 04 Replies to this message: crash_bang2004 (Apr 21, 2007 9:55 am) dddt (May 02, 2007 2:40 pm)
#26 of 506 2001 D-max Mileage by benalbright Mar 21, 2005 (12:43 pm)
Just returned from a 1200 mile trip with the following results:   2001 2500HD, D-max, Allison, Crew Cab, Long Bed, 3.73, K&N air filter, fresh oil change, 82,000 miles:   From Cincinnati to NYC (eastbound), I averaged about 20.5 mpg unloaded, driving 75-80mph.   From NYC to Cincinnati (westbound), I averaged about 18 mpg, with about a 2000lb load that stuck above the cab (extra windload) and a completely packed cab, driving 70-75mph.   I've had no significant problems to date w/ my D-max. I'm concerned about the injector issues but I would think that you would see signs of the problem in your oil if they are leaking within the cylinder heads.   Also, as a note, fuel mileage is directly proportional to the drivers ability to drive smoothly. When my girlfriend took a turn driving, our mileage dropped about 2mpg because she brakes more often and resultantly accelerates more. I usually let the truck coast down to stops by anticipating them and keeping good distance between me and the next vehicle.   As an fyi, installing the K&N air filter had no appreciable impact to perceived performance or economy.
#27 of 506 LLY Duramax Mileage by dugo Mar 26, 2005 (5:38 pm)
Looked at the very noisey Cummins, but Dodge doesn't have a 1.5 cab - just the 2- and 4-door models. Ford had to buy back a bunch of Powerstrokes that ate themselves. So, I went GM. I think it's the ugliest truck ever made, but I like the Duramax. MPG ganges in the 17's. I cruise 80-85 to work daily (74-mile round trip). High 17's. I had a 1,200-pound load for over a tankful for those commutes. 17.3. My old gas truck had to drop to second to pull a local hill with my race car and trailer. The Duramax? It was in 4th gear before I realized what was going on - that I was almost at the top of the hill with little effort. I looked back to make sure the trailer was still there! I didn't have it in tow mode either. 16.8 MPG with the race car back there. Can't argue with the torque. Amazing truck. 24,000 miles on it now. I'm talking to Banks now - we're going to give it a boost!
#28 of 506 2001 D-MAX Mileage by spademan Mar 26, 2005 (8:44 pm)
I recently bought a 2001 D-MAX extended cap short box. I added a K&N air filter thinking it would help with mileage. I've read findings contrary to my hopes. Was this a waste of money? Also, is there any place short of a dealership to get clearance lights for these trucks??
#29 of 506 Can I just say... by rtinaz Apr 02, 2005 (10:48 pm)
That my 2002 Chevy CC 2500HD CC 4X4 is the best truck I have ever owned and I love it. I don't care what engine number it has or what milage it gets, I love it! I tow alot and I do a lot with it, but it is reliable, always delivers, and is almost as comfortable as my Cadillac - and quite frankly: I love it. If you own one, no matter what the year, you are lucky! And chevy owners rock! You may not sit as high at the stop light, but in the end - you own, in my humble opiion, the best damn truck in the world. Enjoy!
#30 of 506 Re: [2manytoys] by luke6 Apr 05, 2005 (8:29 pm)
Replying to: 2manytoys (Nov 21, 2004 7:50 am) we just bought our second duramax.we have owned chevys always.I have sold all the brands with 12 yrs experience.we got 19 to 20mpg unloaded from louisiana to Idaho. We got 16 to 17mpgs loaded with horses or equipment on the highway.My husband got the same 16 mpgs loaded with equipment trailer in town. The Duramax is much Quieter than the cummins and thats a fact,you can not hear our truck in the paper mill you can the cummins.Take a look at your frame on the dodge it is almost half the size as a chevy,look at what holds your steering wheel to the dodge,a pin the size of a pencil. We pass dodges and fords loaded with horses in overdrive every week, half the time its up hill.The dodges injectors do fail as injectors do in all brands,but chevy has an additional 100,000 mile warranty on the injectors with the problem. Dodges are having inpending problems with their transmissions,thats a fact. The fuel mileage really depends on alot of factors,if you get 10 more horses and more torque it may take more fuel,also the driver makes the difference,the tires, the load,the altitude etc...the injector problem has been solved as of mid-2004,in the chevys,the 2001 to 2004 problem injectors are covered,thats a fact.I love our truck.msrp $45,750.00 bought for $37,400.00.loaded. Replies to this message: honda929 (Jun 02, 2005 7:58 am) gribman (Nov 24, 2009 10:44 am) jerrydock (Nov 25, 2009 3:30 am)
#32 of 506 Re: DURAMAX FUEL MILEAGE [blackmax] by larrydi Apr 29, 2005 (7:27 am)
Replying to: blackmax (Sep 19, 2004 1:26 pm) I have an 2002 hd allison ext cab 4x4 GMC Duramax, my mileage is 17 to 18 on the highway empty, 14 to 16 city empty but when I tow anything my mileage drops considerably. I have a 7,000 lb. 5 th wheel, not a high one ether and get 10 to12 mpg towing it. A double snowmobile trailer, maybe 2,000 lbs loaded and get 14 mpg towing it and a couple of smaller trailers which still get aroud 14 mpg. It seems whenever I put anything on my ballhitch my mileage drops way to much, the reason I purchased a diesel was because I,am always towing something and thought my mileage would hardly change with the smaller trailers. NOT SO. I shifted my allison tranny manualy the other day just to see what the pattern was like, I bought each gear to red line 3200 rpm. 1 st gear was 25 mph, 2 nd was 40 mph, 3rd was 51 mph, OD I didn,t bother with but I know it only does 96 mph top end. I have 3.73 in it also. On the highway I drive about 67 mph at 2000 rpm. Any ideas to improve this would be greatly appreciated. TKS. Replies to this message: aarongd (Jun 28, 2005 3:01 pm)

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