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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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I recently bought a 2007 Silverado Duramax with a utility bed on it. I have been averaging 10 mpg in the city and 15 mpg on the highway not towing anything. Its under warranty but the dealer couldn't find anything wrong. Has any one come across this same problem
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| 10K miles I am getting 16,2 MPG in town driving. Mountain/highway driving getting 17.5 MPG. These numbers should be on an EPA sticker on all trucks for comparison! Trailer towing (27 ft - 8000 LBS) 10-12 Mpg - varied driving. This is a 50% increase in mileage from my Ford 10 cyl with more power. Diesel is currently 25% more where I live. So some savings in fuel. | |
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After many months of researching the next truck I was going to buy, I decided to stay with Duramax and the Allison combination. I needed a truck to be able to tow 16.5K plus and all of the dullies GM, Dodge and forget Ford ( I would get a F450 if you paid me, not with all the troubles that truck is having) I decided to get a GMC Topkick custom built by Monroe Truck Equipment. It has all the bells and whistles...330 PH with a 6 speed trans...I'm getting 14 MPG around town and 17 on the Hwy, which is too bad considering the truck weighs 9,000 plus pounds. The air suspension cab air ride and the air cushion seats are a must, and it came with an 8ft pickup bed. How prefect is that! I love the truck, it turn sharper than a Honda Civic and it's the same length as my old Silverado extended cab. There are several of these truck for sale out there, you just have to look for them...and the people selling them are anxious to make deals, that's if you need tow anything heavier than 16.5K. I figure that I keep this truck for several years ans then see what GM and or Ford have to offer. Ford will by that time have their act together with the F450 ...they'll have their own engine in the truck and maybe GM is they're still around will put out a production model of 4500 truck in off the line HD pickup. |
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Replying to: jmcgoff (Oct 25, 2008 7:35 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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