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Pickups Diesels Chevy Silverado and GMC Sierra Duramax Fuel Mileage
506 messages, Last post on Nov 30, 2009 at 5:21 PM
You are in the Diesels Forum. Your Host is kcram
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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.
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Replying to: opmech (Jul 20, 2005 8:37 pm) I would be interested in the programmer you mentioned as well. Mine is a 2004 Duramax LLY engine. Pescador |
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Replying to: roughneck (Jul 25, 2005 5:09 pm) 05duramax |
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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
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Replying to: stoneg (Aug 03, 2005 12:28 pm)
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Replying to: opmech (Jul 11, 2005 8:58 pm)
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Replying to: irishfitz (Aug 03, 2005 4:16 pm)
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| 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! | |
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Replying to: sleadhead44 (Aug 16, 2005 1:13 pm) 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. |
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