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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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  #1  
Old 03-10-2006, 03:46 PM
Dannyboy Dannyboy is offline
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Default LBZ Fuel Mileage

I was wondering what you guys are seeing for fuel mileage with the new LBZ. I'm thinking about buying one.
Any problems with them?
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Old 03-10-2006, 04:21 PM
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Brad Pelot Brad Pelot is offline
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I am lifted with 35's on and I am getting 13.5 to 15.5 around town with some mixed driving, on winter blend. I only have about 4000 miles on this truck. It is getting a little better as time goes on.
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Old 03-11-2006, 07:10 AM
David Proske David Proske is offline
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My truck is showroom floor stock. I have 1200 miles now. I am seeing 17.5 city, about 20 highway. Haven't gone on a trip yet to get a good look at highway milage. Like others say, it will get a little better once she brakes in.
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Old 03-13-2006, 11:34 AM
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Brad Pelot Brad Pelot is offline
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Just got back from a dirt biking trip. pulling a 6 x 12 enclosed with 4 bikes, gear, tool chest, etc. probably around 3000 pounds. Got an average of 12.2 going 82 mph. This is adjusted for odometer error. Not as good as I had hoped but we were going fast in a lifted pickup. The other truck was an lb7 with the almost identical load, he got just over 13 but he was going around 85 to 86 mph.
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Old 03-13-2006, 11:21 PM
soot soot is offline
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My LBZ mpgs are slowly improving. With around 1400 miles on it, I got 17.92 hand calc'ed on a 300+ mile trip into Michigan last Friday running 72-77 mph. No problems whatsoever with mine so far & I like it better than my old LB7.
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Old 03-14-2006, 04:17 PM
mark45678 mark45678 is offline
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5000 mile on it now ... average is just 16.6 mpg on winter blend fuel and its a crew cab 4x4 with a cap , 70 % high way driveing and speeds around 80 mph. It seams like its getting about 1 mpg better then my lly. I will say it has no problem running at 80 where the lly seamed to streach a bit to get to 80. The 2006 allison is the best tuned trans since they started using them in 2001!
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Old 03-18-2006, 05:51 AM
Tsckey Tsckey is offline
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A friend with a new LBZ came up for a visit from Southern CA couple days ago. He just sent me a note to tell me he got 20 mpg on the return trip cruising at 75. I made the same trip in my LB7 a few weeks ago and got 19.26 on the same route at the same speed. I guess that 6th gear helps.

TC
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Old 03-18-2006, 10:02 AM
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Mr. D Mr. D is offline
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Quote:
Originally Posted by Tsckey
A friend with a new LBZ came up for a visit from Southern CA couple days ago. He just sent me a note to tell me he got 20 mpg on the return trip cruising at 75. I made the same trip in my LB7 a few weeks ago and got 19.26 on the same route at the same speed. I guess that 6th gear helps.

TC
Yes, he did! Now he's a member here! The 0.74 extra mpg was sure expensive Tsckey!
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Old 03-18-2006, 05:41 PM
Tsckey Tsckey is offline
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Well! We here it from the man himself! Welcome aboard amigo.

TC
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  #10  
Old 03-28-2006, 07:10 PM
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spongebob spongebob is offline
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Talking

i only have 5500 miles on mine. and i have a ladder rack on with ladders hanging in the wind, 3 tool boxes bolted to the sides and a full load of freon and heavy tools and supplys..my last tank got me 17.0 mph..i travel at 75mph when on the highway..Oh yea im happier than a pig in $hit...my ole dually 454 got 6mph..
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