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Duramax 6600 Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

View Poll Results: LB7 Duramax local driving fuel economy (55-65 mph)
less than 15 mpg (US gallons) (55-65-mph) 97 7.79%
15-16 mpg 251 20.16%
17-18 mpg 337 27.07%
19-20 or more mpg 376 30.20%
Don't own an LB7 - just interested in the poll data 184 14.78%
Voters: 1245. You may not vote on this poll

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  #11  
Old 01-05-2005, 03:26 PM
TMS TMS is offline
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Join Date: Feb 2004
Location: NW Ohio
Posts: 13
Wink

Over the first 10,000 miles I could only get around 14-16. At about 10,000, everything seemed to run "free'er"....most recently a interstate trip back from Kansas in August running at 75+ returned 20-21 MPG !!! [img]smile.gif[/img]
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  #12  
Old 01-06-2005, 09:52 AM
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More Power More Power is offline
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Join Date: Feb 2000
Location: Big Sky Country
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Quote:
gooseneck and tag open trailers
3K and under
3-6K
6-10K
10-14K
14K and up

Enclosed tag trailers
3K and under
3-6K
6-10K
10-14K
14K and up

Enclosed gooseneck/fifthweel trailers
7-10K
10-14K
14K and up

45-55 mph
55-65 mph
65-75 mph
That's 39 polling questions, not counting the fuel economy range and "does not apply" selections for each weight/speed category.

MP
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  #13  
Old 01-06-2005, 12:29 PM
precision37
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Total miles driven in 2004- 17,811
Total fuel used- 825.408 gallons
21.58 mpg average for the year. No complaints.
2002 GMC reg cab,4X4, ZF, stock. Very light towing and some snow plowing.
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  #14  
Old 01-10-2005, 11:12 AM
Scott Glewwe Scott Glewwe is offline
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Join Date: Jun 2000
Location: Lake Elmo, MN USA
Posts: 13
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I have noticed one thing not mentioned in the poll. In the summer months I typically get an average MPG (60% highway) of 17-18. However wintertime sees this drop considerably to the 14-15 MPG range. I assume this is due to the greater amount of "cold weather additive" used to keep diesel moving in the cold weather. Unfortunately for diesel owners here, Diesel is also at its highest price during the winter (competing with the fuel oil market). No big deal but my old 6.5L chevy never saw this big a drop summer to winter.
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  #15  
Old 01-11-2005, 03:41 AM
precision37
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It's a combination of winter fuel and cold temps. The engine doesn't run a top efficiency until it gets up to opperating temp.
Cold weather slows this process down a lot. Sometimes if it is really cold, my truck never even gets over 180 degrees unless I'm on the highway for awhile. Don't forget about having to turn gears and driveline components in cold lube fluids.
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  #16  
Old 01-13-2005, 10:16 AM
Jim Brzozowski
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Worst mileage recorded, 11.73mpg, gooseneck loaded GCVW=24,500.Best recorded 20.73.Running empty@ 68 mph.

Overall Average-49,005 miles, 2,736.93 Gallons=17.9 MPG. in 1101.1 hours=44.505 MPH lifetime average so far. I'm surprised it's that high. I did 453 offroad miles Hunting in Colorado, some it crawling through the canyons in 4 low. It ain't my old K3500 dully, but I sure like the fuel mileage better.
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  #17  
Old 01-16-2005, 07:01 PM
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Kirkes Kirkes is offline
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Join Date: Sep 2002
Location: MANTECA CA.
Posts: 61
Unhappy

I would like to know how you can get over 17 mpg? I have never got more than 16.5 weather I baby it or not.
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2002 SIERRA K3500 SLT,EXT CAB DMAX,ALLISON,ONSTAR,ELECTRIC TAIL GATE LOCK,SPRAY IN BED LINER,
PUTCO 4"STAINLESS STEEL TUBE STEPS,STEEL HORSE TAILGATE STEP,
PRODIGY ELECTRONIC BRAKE CONTROLER. THE JUICE . 6/26/09 154000 Still on factory brakes
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  #18  
Old 01-17-2005, 11:21 PM
Corwin Corwin is offline
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Join Date: Nov 2004
Posts: 8
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17 to 20 most common

Check out results on this link below question (12), results of 61 people from 2001 to 2003 Chev/GMC owners

http://hobbycanada.qazam.com/Surv/Ch...to%202003.html
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  #19  
Old 01-20-2005, 11:03 AM
c5dura c5dura is offline
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Join Date: Aug 2002
Location: Charlottesville, Virginia
Posts: 331
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I can't believe the excellent milage you guys are getting. I got 37k on my truck and have NEVER been able to go 400 miles on a tank. Therefore, I have never seen even 13mpg.

Dealer tells me that is perfectly normaly for a big truck like mine (see sig). Are there any other 3500 4x4 guys out there that have been able to break 400 miles on a tank full?
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  #20  
Old 01-25-2005, 06:08 PM
Inspector
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I have a little over 17K on the clock now and solo average about 14.5 to 15. Never have seen much better than that on the average. I do have J/A installed so that may be skewing the numbers. Towing my heavy rig the milage will be between 9.5 and 11.5. I never drive over 70 with the fiver.
Denny
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