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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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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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| 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? | |
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Replying to: aarongd (Aug 05, 2005 6:55 pm) 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?
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Replying to: sleadhead44 (Aug 16, 2005 1:13 pm) 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. |
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Replying to: stoneg (Jul 22, 2005 6:49 pm)
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