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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
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| My first post was back at #312. I asked about fuel mileage on a long bed two wheel drive diesel with the Allison tranny. Since then I purchased a 2008 Silverado four wheel drive crew cab. I am commuting the 110 miles a day as stated back then. I was hoping to get at least 20mpg to match my old two wheel drive Ford and hopefully better down the road after break in. My commute is about 30 miles of hills and 20 fairly flat. Most days I get right at 20 mpg. Some days a little worse but I have found it seems to make a difference as to the fuel you buy and humidity or rain seems to make a difference also. In the summer I trailed a 16 foot boat behind my 30 foot fifth wheel. On the average ( Interstate ) I got 11.5 mpg. I now have about 20,000 miles so it still early.... I am a moderate driver and stay close to the speed limit. It's amazing how much you watch the instant on-board MPG. and how it effects my driving habits. | |
| Is the LB7 duramax motor better than the LLY motor. From my experiences it is far better. | |
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I have recently purchased a 2008 GMC 2500HD with a Duramax. I have to admit, at first the mileage was not good. Roughly 14 mpg around my normal driving range. and about 17 on the highway. I work for a Chevrolet dealership. (No I did not but a chevy, I think the GMC looks better) I looked up the trucks history on a GM web site. I found it had been sitting for a year. Upon finding this out I changed the oil the following day. I noticed about a 1-1.5 mpg increase. Also as I have put miles on the truck I have noticed the power increase. Therefore break in is a big thing with this engine. I've seen that keeping the RPM's below 2000 in normal driving help alot too. I did get about 21 mpg on a small trip I took with it on the highway after changing the oil also. I am switching to Amsoil at about 10,000 miles to see how it does there. There is one thing I have noticed that makes the fuel mileage drop drastically, and that is the regeneration system for the particulate filter. The mileage dropped to between 12 and 13 mpg. Thank you federal government for that...Any input on MPG tips would be greatly appreciated. Also if anyone wants to know any thing about their GM truck feel free to contact me. I look forward to reading more on this site.
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Replying to: rbb39 (Aug 10, 2008 1:41 pm)
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Replying to: jbull454GMC (Jan 25, 2009 5:20 pm) One thing that I had in my Silverado that I would recommend is a K&N air filter, it will add 10-12 HP, and as you know your will get better MPG with more HP, and colder air. It's pricey but it's the last you will have to buy! 
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Replying to: losman54 (Jan 25, 2009 5:34 pm)
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Replying to: jbull454GMC (Jan 25, 2009 5:44 pm)
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Replying to: losman54 (Jan 25, 2009 5:52 pm)
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Replying to: jbull454GMC (Jan 25, 2009 6:38 pm)
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