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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.

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  #41  
Old 08-23-2006, 10:02 AM
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cowboywildbill cowboywildbill is offline
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Smile

Just did the math after our little trip, we had some stop and go Ranch errand type stuff and a little idle time. The average was 15.9 mpg. Still only 1400 miles on truck. We are happy so far.
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  #42  
Old 08-27-2006, 05:56 PM
Barkbuster Barkbuster is offline
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Just got my new truck this month and still have not taken a trip in it yet. 800 miles on it so far and never let it drop below 1/2 a tank yet. can`t wait to tow something with it. mileage has been good 17.2 1st fill 1/2 tank. and this tank was just over 1/4 ---17.6 mostly 5o mile round trip to work and showing it off to friends love the power l8r bb
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  #43  
Old 08-28-2006, 03:55 AM
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Congrats on your new truck. You should be happy with it when you tow, they pull really strong. Those extra two tires on the back of our truck do knock our mpg down 3 to 5 less mpg overall. I'm guessing, but it seems like the 2500 gets 3 to 5 better than the 3500 does, from what I read on the forum.
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  #44  
Old 09-02-2006, 03:37 PM
Barkbuster Barkbuster is offline
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After another 220 miles in a week 17.1mpg. 2 days at the dealer for fixing the chirping fan belt (who knows how much idling they did?) and 3days to work with some running around on the weekend. 970 miles on it now and the chirp is back
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  #45  
Old 09-03-2006, 11:24 PM
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22 MPG on highway, 14 MPG pulling a 23' travel trailer! These were the best fill up mileages on a 1800 mile trip through the California Sierra and Nevada desert.
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  #46  
Old 09-10-2006, 09:58 AM
Barkbuster Barkbuster is offline
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18mpg last tank. 1/2 hr added to the hr meter while at the dealer for a new belt and pulley adjustment. its getting better! This may give me 20 if I ever get her broke in.
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  #47  
Old 09-27-2006, 04:23 PM
farmerpatrick farmerpatrick is offline
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Default 14.2??

2500 HD 4WD.. extended cab. allison. all power . getting 14.2 on hwy. 9000 miles. Just bought truck. What's wrong with mine? No lead foot here.
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  #48  
Old 09-27-2006, 07:08 PM
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Just passed 200 miles and getting about 17 mpg mixed driving.

Got 22 coming home from Reno on Sunday

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  #49  
Old 09-28-2006, 07:58 AM
BigHerb BigHerb is offline
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I just got my new 2500HD CC LT3 4x4 day before yesterday (09/26/06). I had to drive to a new contract site, about 300 or so miles, and got 16.49 MPG hand calculated. That is a great improvement over my 2003 Silverado SS that got 12 - 13 with the 6.0 HO. This new truck is great!
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  #50  
Old 10-06-2006, 02:18 PM
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Default 13.13??

Mine is an 02 2500HD. I just filled up, 22 gal on the nub and only 289 miles... I figure about 13.2 MPG... I fear the dreaded injector issue....
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  #51  
Old 10-08-2006, 06:04 PM
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I just got back home after a 500 mile trip, not towing and with the a/c off. I manged to keep it at 65mph the entire trip and 99% of this trip was on limited access highways with the cruise on. I have a '06 CC LBZ and it turned over 6,000 miles this trip. Overall economy 22 mpg. I have made this trip before with the a/c on and it drops to 20 mpg. I'm happy. Ed
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  #52  
Old 10-09-2006, 05:10 PM
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Smile LBZ Mileage

My fuel mileage so far, 900 miles on truck, about 15.5 around town with some highway. All 2 lane highway yesterday, 55-60 MPH, with a few small towns, 320 miles, average was 20.6 MPG. This is with calculator, dash showed only 18.5. I did both fillups, one at start and one at end, and made sure it was really full at end. I was happy. This is just a little better than my 02 was getting after 75k.


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2002 Silverado D/A ext cab LT short box, 2wd. MUST SELL!! (see classified)

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  #53  
Old 10-09-2006, 11:44 PM
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Cool

I have an 06 LBZ CC SB, and have been seeing anywhere from 14mpg (all streets mostly), to about 18 on the highway.

I've not been on any long trips (+50miles ea way) to test out to see if I can get 20mpg on the highway (at 67mph).

I've been making a table of a bunch of information so that when I hit the magic break-in number I can see the fuel economy change.

Thus far, almost 3400 miles in, i'm still seeing about 15.

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  #54  
Old 10-11-2006, 05:49 AM
ohsnow ohsnow is offline
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Default 2006 lbz mileage

Had mine since Auguast 16 2006, city as low as 12.6 hwy 21.2 hand calculated.

Total life average is 16.279 hand calculated from new.

Very happy tus far. Present mileage is 3500 and MPG climbs every tank.

Best runs are on hwy 401 to Toronto at 75 mph.
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  #55  
Old 10-15-2006, 03:10 PM
Barkbuster Barkbuster is offline
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Last tank got 18mpg just 3 weeks of back and forth to work. 2000mi. on it now.
No steady highway driving yet. Was hoping for 20mpg going to work so a little disappointed for now. At the rate I`m going it may be a year before its fully broke in, but it is improving.
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  #56  
Old 10-19-2006, 09:59 PM
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I have 2006 LBZ with 13K miles and get consistently 17mpg in city and 23-25mpg on freeway. My optimal mpg on freeway is at 55mph and get 25mph, but I cant stand driving that slow and at 60mph get 23mph and at 65mph get 21mpg and I dont go over that because I'd rather take my time and get better fuel economy. When towing 14,000 lb Fiver I get 12-13mpg on the flats and 10mpg on grades all at 55mph to 60mph. Not bad.... but I noticed when I took my truck into the dealer for the glow plug recall they also reflashed the emissions control and I had a significant drop in mpg...city was 13-15mpg and highway was 17-19mpg....it took about 5k miles for it to break back in... so I suggest when you take your truck back for dealer recalls make sure they do not reflash your emissions computer if at all possible. Just my opinion.
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  #57  
Old 10-22-2006, 12:36 AM
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I've had my '06 LBZ for almost 2 months and I used to get 19-20 highway doing 70 mph and 22-23 doing 55 mph and then ULSD hit and I'm getting 2.5-3 mpg less.
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  #58  
Old 10-22-2006, 06:39 PM
Barkbuster Barkbuster is offline
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Topped off today after a short trip and a day to work and back not even a quarter tank but the bit of cruising I did @65mph helped 18.9 mpg.
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  #59  
Old 11-06-2006, 10:56 PM
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Got 21 MPG going from Vacaville to Monterey last weekend.

CC SB, 33 inch tires, Camper shell, Diablo 65hp, 4 inch cat back.

Cruise control set at 75 mph

I have also had several 18-19 tanks. Love the truck
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  #60  
Old 11-07-2006, 05:24 AM
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I have 35,000km on my 06 duramax and am getting 17-18 mpg but was getting alot better when I first got the truck. I think I need to beat on it for a bit. LOLOL
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