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More Power 12-31-2004 02:27 PM

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.


[ 01-03-2005, 02:33 PM: Message edited by: More Power ]

01-01-2005 07:03 AM

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!

DURA-MAX3 01-01-2005 01:42 PM

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.

J-M 01-01-2005 03:09 PM

I voted but have a 4500. Alot heavier of a truck.

01-02-2005 05:41 AM

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#.

Cliffee 01-02-2005 08:58 AM

I'm averaging 16.5 with mostly short city trips. 1800mi on OD. 2005 LLY

MPH 01-02-2005 02:29 PM

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.

HalsMax 01-02-2005 06:51 PM

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!! :D

[ 01-02-2005, 07:12 PM: Message edited by: HalsMax ]

01-03-2005 09:14 AM

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.

dcalex 01-03-2005 07:57 PM

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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