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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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  #11  
Old 05-06-2007, 04:10 PM
Dakster Dakster is offline
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I hope to see the 17 mpg empty. I got 15 on the way home tonight from the dealer... 2007 3500 CC Diesel, 4x4 Long Bed, SRW.
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2007 Silverado, 3500HD, 4X4, CC, Long Bed, SRW, LMM Diesel, Navi, DVD, Roll-N-Lock Cover, ICI Running Boards, CoastalEtech GM Lockpick for DVD/Nav changes in Motion, Back-up Camera...

2006.5 VW Jetta Special Edition TDI - Blue Graphite - European Spec VW Fact. Nav Radio.
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  #12  
Old 05-10-2007, 06:43 PM
jharden1 jharden1 is offline
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Enroute to work I reset the avg. fuel mileage on the DIC just to see what numbers would come out. 35 miles of mostly level at 70 mph. 21.3 on the DIC.
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  #13  
Old 05-11-2007, 07:44 AM
larryh1 larryh1 is offline
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Default I must be doing somthing wrong

9,000 miles, I have not seen anything above 14.9 - empty. 10 MPG towing 30ft trailer. I have been to dealer twice now. No help there - they have been good about it, but no help. They suggested a programer. I have installed a KN filter and superchip, runing in safe tow. I was told safe tow will offer the best mileage. No change. I checked tire pressure, all is good. I love this truck but fuel prices are going to make me park it.
(I'm not comparing, but my son has the Ford 7.3 we just drove to NM. About 950 miles - towing a small trailer about 1,000 lbs. Got 29 MPG!!! I wouldn't have belived it if I didn't see it with my own eyes!!!)

Any suggestions would be greatly appreciated.

thanks
Larry
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  #14  
Old 05-11-2007, 08:04 AM
Dakster Dakster is offline
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Larryh1,

So far I am on par with you.... 29 MPG on a 7.3 is incredible, that has to be a 2wd truck? I could get 22-24 with a 2wd 6.0 excursion (when it actually ran)..
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2007 Silverado, 3500HD, 4X4, CC, Long Bed, SRW, LMM Diesel, Navi, DVD, Roll-N-Lock Cover, ICI Running Boards, CoastalEtech GM Lockpick for DVD/Nav changes in Motion, Back-up Camera...

2006.5 VW Jetta Special Edition TDI - Blue Graphite - European Spec VW Fact. Nav Radio.
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  #15  
Old 05-11-2007, 07:26 PM
larryh1 larryh1 is offline
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Default I must be doing something wrong

Dakster

That was doing 70 mph (cruise control), flat level driving with an occasional mountain range. I was enjoying ragging him about how much more comfortable my chevy was compared to his ford, until we figured his mpg. I kept quiet after that.

I haven't given up yet. I will be happy with 17/19 empty highway,and 11/12 towing. I am talking to a diesel shop for some less expensive ideas. I'm not going to spend thousands of dollars to get 2 mpg more. I also keep checking this board for any ideas.

Larry
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  #16  
Old 05-12-2007, 06:05 AM
Dakster Dakster is offline
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I hear you... Chevy's definetly have better comfort features... My 2007 Suburban was getting 9-10 in the city and 14-15 on the highway empty/not towing. I'll be happy with 12 in the city and 17 on the highway empty. (20% better fuel mileage). I have nowhere to go but up! I'll get a better handle on what to expect for fuel economy in two months when I drive to tennessee and back.

You can rag on the new 6.4 Ford's, they get horrific mileage. A buddy of mine traded his 2006 Dodge for a new ford (both are dually's) and gets HALF (6 mpg!) of what the dodge got while towing his car to the races. He doesn't know if he can afford the new Ford because of fuel costs! This new DPF/regen requiement doesn't seem to be very MPG friendly.
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2007 Silverado, 3500HD, 4X4, CC, Long Bed, SRW, LMM Diesel, Navi, DVD, Roll-N-Lock Cover, ICI Running Boards, CoastalEtech GM Lockpick for DVD/Nav changes in Motion, Back-up Camera...

2006.5 VW Jetta Special Edition TDI - Blue Graphite - European Spec VW Fact. Nav Radio.
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  #17  
Old 05-16-2007, 07:06 PM
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Stlheadake Stlheadake is offline
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Default My two cents....

I put on the Kennedy 4" turbo back pipe and saw an immediate change in mileage. I went from 15 around town to 16 and some weeks 17. I can get 19 steady on the highway running 70. If the wind is right, I have touched 20 but it is a rarity.

I too am looking to consistently get in the 20s with mine. It is a daily driver that I use to tow our camper about every other weekend.
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  #18  
Old 05-26-2007, 08:13 PM
jharden1 jharden1 is offline
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17.9 DIC last tank of mostly freeway. 2k miles. DIC said I used 20.7 and I put in 21.2, off about 2%.
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  #19  
Old 06-15-2007, 05:45 AM
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DMAX-HD DMAX-HD is offline
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avg 17 both hwy and city. 3rd tank of fuel
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  #20  
Old 07-03-2007, 07:28 PM
1stDiesel 1stDiesel is offline
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I have run 3 tanks of fuel through my new 2007. It is the 2500 crewcab. I filled up today and found I got 14.6 MPG on routine and city driving. I was hoping for better, will it get better? Going camping this weekend will let you all know how that goes pulling my trailer...
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