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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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  #21  
Old 01-27-2005, 05:02 PM
ibelyea ibelyea is offline
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Join Date: Mar 2000
Location: Vancouver, WA 98682
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I have and 02 with "Edge" and never see more than 17.5 solo and 10-12 pulling my 5th wheel. I did go as low as 7.5 in North Dakota, but that was with a 40MPH head wind and 50 MPH. While I would like to get better mileage, I'm a little to heavy footed to really realize any better.
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  #22  
Old 01-28-2005, 11:38 AM
birddriver birddriver is offline
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Join Date: Jul 2002
Location: Arlington,Texas
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At 75 on hwy, I am disapponted to see less than 22mpg at 60 I get 24mpg my city average is 17 with 28000 on the clock the only mod is a ventalated air box and a soft toneu cover
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...and they went away praising God.<br />03 DURAMAX/ALI CC LB RED/GRAY LS<br />Ordered 04/03/03 Made 05/29/03 Got 07/05/03<br />1969 CST/10 short/wide 350/400 2wd FOR SALE<br />1997 Grand Prix GT HUD Black(Momma\'s Grocery gettter)<br />1994 30ft. Dutchman RV. TT
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  #23  
Old 01-31-2005, 01:49 PM
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More Power More Power is offline
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Location: Big Sky Country
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I filled up late yesterday. Fuel economy for this tank was 17.8 mpg - winter fuel in January. Pretty typical.....

MP
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  #24  
Old 02-04-2005, 09:31 AM
moondoggie
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Good Day!

birddriver: Are you calculating your mpg from your odometer & the gallons you pump, or from an electronic readout in your cab? If you
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  #25  
Old 02-14-2005, 06:52 AM
moondoggie
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Good Day!

birddriver: Please don't take this truck to your dealer, then get it back & tell us you now get 18 mpg - get it to someone who knows about these things & find out why you're doing so well, if that's possible. Then for those few of us where mpg is more important than snort, we can duplicate whatever you're doing or what's different about your truck.

Blessings!

Brian Johnson, # 5044
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  #26  
Old 02-16-2005, 08:52 AM
PONCH
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Last year (winter) I went on a 6000 mile trip towing my 28.5ft tag loaded at around 9000lb. I drove the northern route to Phoenix, flagstaff and down,then the southern route back to IL
Going out I averaged 70mph coming back was 60mph. This was hand figured at every stop as well as at the end.
Without towing and traveling I run 72 and will get 17.5-18 around town and normal driving I get 18-18.5
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  #27  
Old 02-16-2005, 01:48 PM
DA_MAXX DA_MAXX is offline
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Join Date: Jun 2003
Location: Port Orchard, WA
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03 d/a, cc, 41K miles. Consistently average 18mpg. Haven't seen anything over 20+. I filler up to the top of the cap everytime and calculate the mileage manually. Daily driver, 38 miles one-way to work, 97% freeway, doing 70mph. No performance mods. Have had 1 injector replaced and 1 allison tranny replaced.
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  #28  
Old 02-20-2005, 01:00 PM
Spartus Spartus is offline
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Join Date: Feb 2003
Location: Kalamazoo, MI
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22mpg Highway @ 80mph.
17.5mpg mixed driving.

14-16mpg towing 6,000lbs @ 75mph.

I tow with Attitude set at level 1. Stock exhaust, stock air box....
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  #29  
Old 02-21-2005, 07:49 AM
Hottruck Hottruck is offline
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Join Date: Jul 2000
Location: Turner,Me. USA
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Angry

Hey all,
I've never gotten better than 14.5 mpg D/A and I'd like to know what I have to do to improve. I've got about 35,000 miles now..
Thanks for any input...
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  #30  
Old 03-09-2005, 08:29 AM
birddriver birddriver is offline
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SORRY for the long delay in a reply.
A few times I have checked the mileage by hand.
mostly it is of the DIC. Fuel used is always within a 1/10th or so from what I refill to.
I always fill it to the brim so there is no guessing in that.
When I modified the air box I Removed three sides leaving the engine side,bottom and the four corners, also removed the foil patch from the inner finder. Then I smoothed the top and heavly blended the air tube transition and blocked off the little bulb "do-hicky" at the other end.
I use No additives or synthetic oil.
The best I can say is that the LORD has blessed me with a good truck!
Please note: My truck is TWO wheel drive.
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...and they went away praising God.<br />03 DURAMAX/ALI CC LB RED/GRAY LS<br />Ordered 04/03/03 Made 05/29/03 Got 07/05/03<br />1969 CST/10 short/wide 350/400 2wd FOR SALE<br />1997 Grand Prix GT HUD Black(Momma\'s Grocery gettter)<br />1994 30ft. Dutchman RV. TT
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