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Old 08-18-2010, 04:38 PM   #1
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MPG on 2008 Dmax?

I bought a 2008 K3500 DRW to tow a heavier trailer in '08. Traded in a K2500 Dmax that got 21MPG on the highway and 16MPG towing a 10K lb trailer. This '08 truck gets 11MPG driving around town and 17MPG on the highway solo. I know the DPF is a major difference in trucks, but wondered if anyone else is having horrible mileage with this vintage truck (GM or other). I am taking it in for repair for an oil leak in a tube that goes to the turbo next week. Last week they replaced two sensors that were causing a check engine light and the speaker that gives you the "ding" when the key is in the ignition. Also see Computer Problem thread below. This truck has 14K miles on it and I'm now averaging 2000 miles between repairs. Can't wait 'til the warranty is up.
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Old 08-18-2010, 06:37 PM   #2
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This truck has 14K miles on it and I'm now averaging 2000 miles between repairs. Can't wait 'til the warranty is up.
Ed, Maybe I'm wrong about this but I'm thinking the MPG thing is all because of your final drive gear in the 3500 ??

Too bad about the repair interval.
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Old 08-21-2010, 07:53 PM   #3
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You are moving more weight with the 3500 dually than with the 2500. My 02 K3500 dually gets 15 empty around town, 18.5 highway. Driving style is a huge factor too.
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Old 08-23-2010, 05:28 AM   #4
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I realize it is heavier, but not that much heavier. I'm very conservative w/ the accelerator because it is such a fuel hog. I was wanting to hear from those that have trucks w/ the DPF to see if their mileage is comparable.
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Old 08-23-2010, 06:16 AM   #5
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Ed,

When we started rving we pulled a 32' with a F250. It got similar MPG as your GM. When we traded up to a 14K 39' 5er we went to the F550. Our mileage dropped dramatically, down to 14 mpg with out towing the 5er and 10 mpg towing. It was the additional weight and gearing that brought ours down. DRW's generally are geared quite a bit lower than the 2500.

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Old 09-30-2010, 09:50 PM   #6
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2 bad there is not a requiremnt for manufacturers to pul fuel effiencey on all trucks
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Old 10-27-2010, 08:04 AM   #7
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I just got 10.5 MPG towing our fiver up to Hickory from eastern NC. I had to leave the fiver and coming back I got 19.5.mpg. coming back. I did not drive it easy either way as I had to 600 miles in one day. When I could I ran 70 + .
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Old 11-03-2010, 08:00 AM   #8
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I've read that the dually loses about 2 mpg compared to the SRW due to extra weight and friction. Your mileage is about right for that truck.
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Old 11-28-2010, 06:01 PM   #9
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I have 2006 3500 drw Duramax and get 18-19 hwy and 9-11 towing our 38 ft Bighorn. I think that great mpg towing such a large rig.
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Old 07-21-2011, 05:50 AM   #10
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Originally Posted by evan0810 View Post
I bought a 2008 K3500 DRW to tow a heavier trailer in '08. Traded in a K2500 Dmax that got 21MPG on the highway and 16MPG towing a 10K lb trailer. This '08 truck gets 11MPG driving around town and 17MPG on the highway solo. I know the DPF is a major difference in trucks, but wondered if anyone else is having horrible mileage with this vintage truck (GM or other). I am taking it in for repair for an oil leak in a tube that goes to the turbo next week. Last week they replaced two sensors that were causing a check engine light and the speaker that gives you the "ding" when the key is in the ignition. Also see Computer Problem thread below. This truck has 14K miles on it and I'm now averaging 2000 miles between repairs. Can't wait 'til the warranty is up.
Ed
Ed, I realize this thread is a year old but justa let you know, my mileage mirrors yours. Disappointing, huh. A great towing machine though.
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Old 07-28-2011, 11:15 AM   #11
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Yep, old thread, but I'll add a couple of comments: For one thing, all the GM Duramax/Allison combos have 3:73 gears, be it SRW, DRW, 2500 or 3500. I don't think there is even an option for anything different. I had a 2005 K3500, got 10 to 11.5 pulling our Montana, 18 to 20 Solo as long as it was kept under 65, any faster and you would see a drop. Now have a 2011 K3500, same basic setup, 10 to 11.5 towing, 17.5 to 19 solo, but have only done a few solo trips, most of the time it's towing the Monty.
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Old 08-30-2012, 04:57 AM   #12
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I have an 08 Silverado 2500HD I was getting around the same mileage with mine. 17MPG highway, and about 12 around town. Since my 100K 5 year power train warranty was going to be expired this December. I decided to take the truck up to Danville Performance outside of Indy to have some work done on it. I had the PPE exhaust manifolds, A EGR blocker plate, PCV re route, a MBRP turbo back 4" exhaust and a EFI live tow tune with turbo brake put on the truck. It cost me $1549 for everything, but it's like driving a different truck. The power is amazing and I went from 17MPG highway to 21MPG and 8.6MPG towing to just under 11 towing a Voltage V3200.

A lot of people talk about blowing your rig up if you add a tune to your truck and I say thats a lot of hot air. I have installed the EGT temp gauge and a turbo boost gauge on the A pillar and my EGT's haven't gone any higher then they did while the truck was in DPF regen, not to mention I no longer have raw fuel being dumped into my cylinders.
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Old 09-04-2012, 04:49 PM   #13
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I'm wondering what the EGR blocker would do for my 2007 LBZ. Im running with a Edge Juice/Attitude and get between 19 and 20 on the road, empty. Pulling my 30 ft TT, I'm down to 10-11. with the Juice set on 1, my EGT never been above 1,300 while towing in the mountains. I usually run in the high 800's on "regular" roads.
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Old 09-05-2012, 03:00 AM   #14
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Give Mark or Larry a call at Danville Performance. They are both very knowledgeable about the Dmax's. I cannot believe mine has as much power as it does on just a tow tune. The thing tows like a mule, and the fact that it picked up good mileage is no less imprssive. Here's their facebbok page https://www.facebook.com/pages/Danvi...e/173238019397
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