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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 04-29-2011, 06:46 AM
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Arrow LML Fuel Economy

We are getting just a tad better mpg towing with our LMM than we did with our 07 classic LBZ. And about 1 to 2 mpg better empty. It gets about the same as our 02 GMC did.
And it pulls better "way better than they did. Even with the exhaust and edge on the 02.
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Old 05-07-2011, 07:55 AM
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FYRWOOD GUY FYRWOOD GUY is offline
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my truck just went to 14 mpg and its still got the break in oil in it.
it's on it's 4th tank of fuel.3rd fuel filter. 2545 miles.63.5 gal fuel tank(s)



i'd like to know what other 2011 3500HD people are getting for MPG with their rigs
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Old 05-31-2011, 06:03 AM
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I'm in the market and would like to see some real world reports on mileage. All I have found so far is predictions and outlandish claims. Maybe there's not that many owners of 2011s here yet to report?
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Old 09-23-2011, 07:04 PM
moss6 moss6 is offline
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In my experience, no way is the LML more fuel efficient than the LBZ; towing that is. Just got back from 1500 mile trip in which the conditions were as good as I've ever experienced and the LML was a tad less than 10mpg. Just a guess but I'd suspect the LBZ would have been about 12 on that haul. Non towing the LML may be 1mpg better city and about the same on the highway.
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Old 09-24-2011, 08:02 AM
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Well I don't know what others are getting but I know what our lml is getting and what our lbz got mpg wise and we tow very heavy. And it isn't an out landish claim. I have no reason to lie. And even if this truck got less mpg than our lbz did I would still be happy. Just due to the brakes and so forth on this new truck. I haven't changed my fuel filter yet if someone has changed their fuel filter 3 times in 4 tanks of fuel ? you think maybe fuel is their issue and not the truck ???. I only have 7,000 miles on it so far and love it.
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Old 11-11-2011, 05:45 PM
moss6 moss6 is offline
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11,000 miles, new fuel filter and oil, last towing trip of the season, unfavorable wind, 8.1 mpg. LBZ conservatively would have been 1 mpg better, that route run enough times to know. LML unloaded, adverse city, 12.5, LBZ would be 11.5. LML pulls hotter, but a tad stronger. Overall LML a much better truck in so many respects.
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  #7  
Old 11-14-2011, 07:04 AM
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Talking

I have noticed big differences in mpg on my last 3 d/maxes when going from summer to winter blend fuel. The winter fuel seems to drop it a couple of mpg on average. But then maybe some of that is due to warming up and idleing in cold weather. And now with remote start that add's more idle time. Spoiled "haft" to go out to a warmed up truck now. LOL
How did we survive before all of that?
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Old 11-14-2011, 02:30 PM
SoTxPollock SoTxPollock is offline
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Changing fuel filters 3 times in 4 fillups. Why? You are probably loosing fuel each time you remove a full filter some probably runs out before you can get the new one on. Let it run a few thousand miles, oh and by the way , my fuel mileage continued to increase for about 60,000 miles incrementally just a little every few thousand miles, it took that long for the engine to feel like it was finally broken in. Once you've got the engine and drive train broken in where it runs more free, you should see your mileage increase. I've followed WildBills posts for years and you may just as well believe what he tells you because no one has a good enough memory to lie about something, they will always get caught. I've never heard him say anything that contridicted what he previously said in other posts. I have a good friend with a 2011 and he says he's only getting about 14 mpg. One day I looked at his new truck. It's got a giant steel flatbed with double heavy headache rack, there are two tool boxes loaded, an auxillary fuel tank that he had special made that holds 150 gallons of diesel, he's got chain saws, shovels, tools of all kinds strapped to it. The back seat is folded down and so help me there is not room to put a lunch pail in the back seat, it's stacked to the headliner with stuff he uses in his fence building business everyday, so he never unloads anything. He's usually towing a 16' lowboy trailer with a bobcat on it with fence posts pile up 4 feet deep and he wonders why he can only get 14 mpg. I asked him what his previous F**d truck got and he said you don't want to know and besides it cracked two sets of heads on that 6.0. I assured him the only reason he will have to get rid of the Chevy is because he wants a new truck. It's not gonna break and it's not gonna wear out, unfortunately he will never know what mileage it gets empty, because it never gonna be empty while he owns it.
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Old 11-14-2011, 06:52 PM
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I have been flogging the snot out of my 2009 since I bought it with 15K miles in August 2010. Fast forward to November 2011 and it has 83K and the towing mileage average is solidly superior to either LBZ I ran prior.

It pulls harder, rejects heat better, and on the rare occasion that I drive it empty it gets 21mpg.

Like a freekin' rock!
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  #10  
Old 05-10-2012, 08:53 AM
toneash toneash is offline
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Default Mpg

I have a 2012 2500K with a Duramax and Allison Transmission. I am getting 16 mpg empty driving partially highway and city. I was wondering what kind of mileage I can see during my trip to San Diego. Going there unloaded but pulling a uhaul trailer with a 2004 Pontiac Grand Prix back.
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