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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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#65 of 506 Re: What's involved in recalibrating? by 05duramax Jul 24, 2005 (5:35 pm)
Replying to: stoneg (Jul 22, 2005 6:49 pm) I would like to know if all dealers can do this (recalibrate for different tire size) as the standard 245s are pretty lame looking. Can you get the 285s in blackwall? I'm not a big fan of raised white letters. Sure, I know you can turn them around, but are there any true blackwalls in that size/load capacity? Now have over 2,500 miles on my 2005 2500 HD with Duramax and it's a great truck, overall, save for the look of the tires. Been a Ford man most of my life, but this Chevy is an extremely good truck. I saw an 06 Ford F-250 SuperDuty today with their 20" rims/tires and it looks very, very good. Don't need to have 20's on my Chevy, just something that fills the wheel wells better than the pizza cutters that came on it. Replies to this message: stoneg (Jul 24, 2005 5:50 pm)
#66 of 506 Re: What's involved in recalibrating? [05duramax] by stoneg Jul 24, 2005 (5:50 pm)
Replying to: 05duramax (Jul 24, 2005 5:35 pm) I have read that dealerships are charging around $100 to recalibrate for larger tires sizes. My local dealership did not charge me a penny. Some of the performance programmers claim to be able to recalibrate, but none that I have researched will do the LLY motor (LLY= 8th VIN # digit is a 2) for some reason. I went the 285/75/16 load range "D" in the BF Goodrich All Terrain TA ko with the raised white letter out (my truck is white) so it looks good to me. I had to due some very minor trimming to the front valence to keep from rubbing, but I probably could have gone 295 or 305 after the trim. I have had a leveling kit installed prior to the new tires (raised the front up 2 1/2 inches to bring it to same height as the back). I saw an 05 F250 Diesel King Ranch with the same kind of tires as mine on 22" at the Ford Dealership here in Tallahassee, FL (It did look awesome) You can always put larger tires/rims on the F250 than the 2500 due to the wheel wells being more rounded than squared as the GMC/Chevy's are.
#67 of 506 blackwall tires by roughneck Jul 25, 2005 (5:09 pm)
05duramax        I am sure there must a tire out there that size that is a blackwall only. The load range might be a different story. If you don't put a heavy load on the D range will work. All the tires I saw had the D range in the 285's at the tire shop. But if your like me you might not find a tread pattern that you like and blackwall. I have a 04 chevy duramax crew cab long bed and just put 285's on it. Cooper STT(white outlined). They have a pretty aggressive tread pattern, a little noisy. I had to lift the torsion bars 1", front end alignment, shaved a hair off the front valance and some cutting of the driver side inner fender well. I still have a little rub on the back of the fender well. The only reason that still rubs is the parking brake cable makes the fender well stick out just enough to rub at full crank of the wheel. I'm real happy with how the truck looks now. I had the pizza cutters before too. But a word of advise that all tire shops might not tell you. The stock 6.5" wide rims are not recommended. It can cause uneven tire wear and all other kinds of problems. You should get at least an 8" rim or so. They'll mount up on you stock rims but I wouldn't do it. Your just asking for problems down the road. Also I haven't recalibrated my speedo yet I'm going to get a programmer for that I still have the LB7 motor plus get some more power, I can already tell the difference in fuel mileage already. I would have to guess I'm getting about 16mpg. Before I was getting around 19mpg. A guy at work put 305's on his 02 duramax and had to do some more trimming on the valence and just a hair on the bumper along with what I did, and it looks real good too. Replies to this message: 05duramax (Jul 26, 2005 12:47 pm)
#68 of 506 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [opmech] by pescador Jul 26, 2005 (11:39 am)
Replying to: opmech (Jul 20, 2005 8:37 pm) Dave:   I would be interested in the programmer you mentioned as well. Mine is a 2004 Duramax LLY engine.   Pescador
#69 of 506 Re: blackwall tires [roughneck] by 05duramax Jul 26, 2005 (12:47 pm)
Replying to: roughneck (Jul 25, 2005 5:09 pm) Thanks to you and the others for advice on this. Most appreciated.   05duramax
#71 of 506 Real MPG numbers by stoneg Aug 03, 2005 (12:28 pm)
Alright fella's, here's the update. My 05 DM has 1,100 miles on it now. With every tankfull my mileage gets better. The last tankfull average was 11.8 mpg I was getting as high as 17.5 mpg highway 60 mph and now 13.5 in the city Replies to this message: irishfitz (Aug 03, 2005 4:16 pm) 06lly (Aug 16, 2005 9:06 am) jmccormick1 (Sep 22, 2005 2:13 pm)
#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)

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