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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

View Poll Results: 2004.5 or newer LLY Duramax local driving fuel economy
less than 15 mpg (US gallons) (55-65-mph) 450 41.82%
15-16 mpg 158 14.68%
17-18 mpg 162 15.06%
19-20 or more mpg 218 20.26%
Don't own an LLY - just wanted to see poll data 88 8.18%
Voters: 1076. You may not vote on this poll

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  #1  
Old 12-31-2004, 01:27 PM
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More Power More Power is offline
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Default 2004.5+ LLY Duramax Fuel Economy Poll

Fuel economy is one of the top 2-3 reasons why most people buy a diesel pickup.

What we want to do here is help determine what people are seeing for non-towing fuel economy in actual on-road use.

Let us know what your LLY Duramax powered 2500HD/3500 truck delivers.... This poll is for owners of the 2004.5 or newer LLY. We are assuming summer blend fuel.

You will need to vote before viewing the poll data. If you don't own an LLY, but would like to see the poll data, you'll need to first vote in the poll using the "Don't Own an LLY" selection for both the local driving and highway driving sections.

Round your fuel economy averages to the nearest whole number. For example a 16.4-mpg would be 16, a 16.8-mpg would be 17.

MP

[ 01-03-2005, 02:33 PM: Message edited by: More Power ]
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  #2  
Old 01-01-2005, 06:03 AM
Kennedy
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Here again, I voted a bracket down. I have seen 18.8 and 18.9 hwy, but couldn't justify the "push" to the 19-20 bracket. Not bad for only about 3k on the clock, and no bed cover yet!
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Old 01-01-2005, 12:42 PM
DURA-MAX3 DURA-MAX3 is offline
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In 8800 miles mine is averaging 12 mpg. So far I am not impressed but it runs decent. I am going to put a chip on it and have fun. I figure if it gets poor mileage might as well make run like the wind.
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Old 01-01-2005, 02:09 PM
J-M J-M is offline
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I voted but have a 4500. Alot heavier of a truck.
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  #5  
Old 01-02-2005, 04:41 AM
carco
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I wonder just how much a K2500 DA can pull?? I pulled 10000# yesterday 100 miles several hills WOW it pulls!! 8000# 38'gooseneck enclosed w/ 4 ATV's, 1 dirt bike, gear and 4 people. Southern Ohio, N Ky. hills, both sides of the Ohio river. I thought mileage would be 12-13 but was only 10.7 mpg for 104 mile round trip @ average 43 mph. A little disapointing for 17500gw, my C6500 w/ Cat 7.2L @ 10.88 mpg over 804 mile trip @ 68-72 mph to GRapids Mi. @ 20000#.
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Old 01-02-2005, 07:58 AM
Cliffee Cliffee is offline
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I'm averaging 16.5 with mostly short city trips. 1800mi on OD. 2005 LLY
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Old 01-02-2005, 01:29 PM
MPH MPH is offline
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I too have been a little dissapointed in the lly's mileage. driving home from the dealer it averaged 18.4, which I was impressed with, but it has never been that high since. Pulling a little two place snowmobile trailer, i was only seeing about 11 mpg. I put 305's on it right when i got it home. could this have affected it that much? It didn't seem to drop the LB7 that far.
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Old 01-02-2005, 05:51 PM
HalsMax HalsMax is offline
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I just took a 400 mile trip. Averaged 19 cruising between 70-75. Programmed the Hypertech PP to stage 2 and she got 17 on the same trip, but was a lot more fun passing on two lanes. I have under 5K miles and am impressed with the mileage and pulling power. Gonna leave her on stage 2!!

[ 01-02-2005, 07:12 PM: Message edited by: HalsMax ]
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  #9  
Old 01-03-2005, 08:14 AM
Kennedy
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Having never owned a truck with an avg economy computer, (DIC) it has proven enlightening. While accuracy is sometimes not the greatest, and is really thrown off with many tuners/modules, it DOES give pretty good indication of what happens when you blast past csomeone or let the truck idle, or even drive off cold and the trans is in cold shift mode etc..

In order to get decent mpg you need to excercise restraint when passing, and minimize cold engine and idle operating time.
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Old 01-03-2005, 06:57 PM
dcalex dcalex is offline
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You gotta be careful in looking at the percentage results on the poll....the question directed to the people who don't have a Dmax (which is the majority responding) is included in the percentages and it skews the results.

To date the percentages without the skewing question is this:

less than 15 mpg........5....11%
15 - 16.................14...30%
17 - 18.................17...37%
19 - 20.................10...22%

Thats 59% getting better than 17 mpg....not bad at all for that powerful an engine. [img]smile.gif[/img]
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