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Pickups Diesels Chevy Silverado and GMC Sierra Duramax Fuel Mileage
490 messages, Last post on Oct 09, 2009 at 6:05 AM
You are in the Diesels Forum. Your Host is kcram
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Replying to: jodie1614 (Apr 26, 2009 4:43 pm) |
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For some reason I am getting crap for mileage on this 05 silverado 2500.......1500 to the gallon. My last 2500 (an 04) I had, I was getting on the hiway anywhere from 22 to 28! I have bought both used, and I don't know if the 04 was chipped or not, but she was a runner. Any suggestions for the 05. Econ shows 15.5 at 1800 rpm's on the hiway. Thanks folks, Boomer  
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Replying to: boomd (Jul 02, 2009 8:50 pm)
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Replying to: jbull454GMC (Jul 03, 2009 1:10 pm) First comes attention to the drivetrain. Get high quality filters for the engine, fuel, air and transmission. Replace all your filters. Use synthetic oil. I like either Rotella or Amzoil. Add a bottle of fuel additive to the fuel. I like Lucas; but I am sure there are others that work well. Now check yout mileage...carefully. I like to do at least 4 tansk in different conditions to get a baseline. Still nto better? I would suspect the tires. I can't begin to tell you what a huge diffference tires can make on a vehicle. Still no good? You might jsut have a truck that is not going to get good mileage. I don't know why this happens, but some are just better than others.
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Replying to: jbull454GMC (Jul 03, 2009 1:10 pm) |
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Replying to: jerrydock (Jul 05, 2009 3:41 am) Thanks, Boomer
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| I live not far from Morane Ohio where the Dmax plant is. I talked an employee there a few days ago. He told me an interesting story about the new duramax emissions. He said every 6000 mile you will have to pour some find of fluid in the intake to burn off soot in the catalitic convertor. This does not sound like a great selling item. It says on this site abour the new duramax and "pouring" money into it. I guess they weren't kidding... | |
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I pulled a stupid stunt on Labor Day as I traded in a 2006 2500HD with the 6.0L engine. I bought this truck new in 2006 to pull my tractor and my horse trailer. At freeway speeds pulling an empty 24' gooseneck flatbed I would average 9.5 mpg. Without the trailer, I would average 14.5-16 on the highway. Now to Duramax. It is an 07 Z-71, crew cab. The economy is pathetic. Pulling the empty trailer I get 10.5. At highway speeds with no trailer I can average 15.0. I got that with the gas rig, and the fuel was cheaper. I have thought about buying the programmer, but if it's not going to make a drastic difference I cannot justify the $379 expense. This was my first diesel; and probably my last if this is the norm. It's not worth it both for fuel economy as well as the cost for service.
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Replying to: donnieray (Oct 09, 2009 4:58 am) |
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