View Poll Results: LB7 Duramax local driving fuel economy (55-65 mph)

Voters
1245. You may not vote on this poll
  • less than 15 mpg (US gallons) (55-65-mph)

    97 7.79%
  • 15-16 mpg

    251 20.16%
  • 17-18 mpg

    337 27.07%
  • 19-20 or more mpg

    376 30.20%
  • Don't own an LB7 - just interested in the poll data

    184 14.78%
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Thread: 2001-early 2004 LB7 Duramax Fuel Economy Poll

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  1. #1
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,418

    Default 2001-early 2004 LB7 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 truck delivers.... This poll is for owners of the LB7 (2001-early 2004 model Duramax 6600 engines). We are assuming summer blend fuel.

    You will need to vote before viewing the poll data. If you don't own an LB7, but would like to see the poll data, you'll need to first vote in the poll using the "Don't Own an LB7" 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, 02:32 PM: Message edited by: More Power ]

  2. #2
    Kennedy Guest

    Post

    I placed my numbers in the 15-16 off hwy, and 17-18 on hwy, but in reality, I run near 17 off hwy, and near 19 on hwy pretty consistently. I'm seldom down to 16 off hwy, and seldom in the low 18's hwy. Just did not feel that I quite made the next brackets...

  3. #3
    Join Date
    Jan 2002
    Location
    Angelus Oaks, CA
    Posts
    95

    Post

    More Power,
    How about a second poll on mileage while towing. Might break it up into weight ranges.

  4. #4
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,418

    Arrow

    Weight, wind drag and speed introduce a lot of variables when towing.... It'd be tough asking the right poll questions that would include all of the possibilities.

    Open to suggestions....

    MP

  5. #5
    Join Date
    Dec 2004
    Location
    Ohio
    Posts
    6

    Post

    MP, it might be good to run a 3 different polls for trailering, one for pulling gooseneck and tag open trailers (utility trailers, machinery trailers, and open car haulers), enclosed tag trailers (car haulers and rv trailers), and gooseneck/fifthweel enclosed trailers (Car haulers and rv trailers)... and then in each class break down into weight ranges ie.

    gooseneck and tag open trailers
    3K and under
    3-6K
    6-10K
    10-14K
    14K and up

    Enclosed tag trailers
    3K and under
    3-6K
    6-10K
    10-14K
    14K and up

    Enclosed gooseneck/fifthweel trailers
    7-10K
    10-14K
    14K and up

    additionally, give the respondents an opt out for each weight category as you have done on this poll so that people may just view the post. This will allow people to respond to the weights which they most pull

    just my 2 cents
    2002 GMC 2500HD CC/SB 4x4 D/A<br /><br />\"The Duramax Diesel Knows how to be livin\'....Just keep the wheels spinnin\' and the beavers grinnin\'!\"

  6. #6
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,418

    Post

    What towing speeds?

    MP

  7. #7
    Join Date
    Jan 2002
    Location
    Angelus Oaks, CA
    Posts
    95

    Post

    45-55 mph
    55-65 mph
    65-75 mph

  8. #8
    Join Date
    Jan 2005
    Location
    Riverside, CA
    Posts
    3

    Post

    I hope I see 19-20 MPG some day out of my truck. Be curious to know how many of the 19-20 range are stock and how many of those are 6 speeds.
    2003 GMC D/A CC 4X4
    Loaded execpt for Leather and XM "bone stock"

  9. #9
    Todd Manning Guest

    Post

    I just did an extended highway trip and purposely drove between 55-60mph the whole distance to check my mileage. Ended up getting 23 mpg (Imperial gallons), so this 19 mpg US (assuming my math is right).

    2003 LB7 D/A with Magnaflow 4" exhaust and K&N air filter.

  10. #10
    Todd Manning Guest

    Post

    I just did an extended highway trip and purposely drove between 55-60mph the whole distance to check my mileage. Ended up getting 23 mpg (Imperial gallons), so this 19 mpg US (assuming my math is right).

    2003 LB7 D/A with Magnaflow 4" exhaust and K&N air filter.

  11. #11
    Join Date
    Apr 2006
    Location
    Durham, Ont. Canada
    Posts
    8

    Thumbs up

    Getting an easy 20mpg highway. Up to 23 on longer trips with '04 EC LB 4x4 SRW and the Juice with A2 set on milage(#1). Also installed a K&N air filter and modified the stock air box which helped a bit. I'll keep working on it.

  12. #12
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,589

    Question

    Quote Originally Posted by DRINKDIESEL
    Getting an easy 20mpg highway. Up to 23 on longer trips with '04 EC LB 4x4 SRW and the Juice with A2 set on milage(#1). Also installed a K&N air filter and modified the stock air box which helped a bit. I'll keep working on it.
    Just curious.
    Is that mileage from the DIC, or are you calculating manually?
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  13. #13
    Join Date
    Apr 2006
    Location
    Durham, Ont. Canada
    Posts
    8

    Default

    From the DIC. I was getting ~17 before the mods on the DIC.
    I'll calculate it out on the next fill up.

  14. #14
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,589

    Arrow

    The reason I asked, is when using a power adder, the DIC tends to become quite optimistic. Usually, a very disapointing reality is discovered once the mileage is calculated manually. This inaccuracy is normal and consistent with the operation of the module/programmer. Problem is, the manufacturers don't disclose this in their literature. Most folks just go on thinking the mod has given them great mileage.

    Please get back to us with your results. Some folks reported the DIC mileage was still accurate with a module installed. If one can do it, they all can. There's no reason to not have the DIC calibrated, if it's possible. In either case, we should either have a calibrated DIC, or a formula to determine actual mileage from the DIC info.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  15. #15
    Join Date
    Aug 2006
    Posts
    15

    Default

    i recently switched to 285/75/16 and my mileage droped almost 2mpg. is that normal. also with 285's how off is the odometer. i heard almost 5%?

  16. #16
    Join Date
    Dec 2004
    Location
    Texas
    Posts
    683

    Thumbs up

    JUST COMPLETED THE CALCULATIIONS.
    100,278 MILES, 5,394.74 Gallons of fuel used, = 18.588 MPG average for the first 100.

    I knew that Edge was going to make it drop off!!
    Long live LB7's.
    02 2500HD LT D/A SB CC 4X4 BLACK, Westin stainless nerf bars, BW GN Hitch,Racor 60S post oem fuel filter, Oil Guard bypass engine oil Filter. All synthetic fluids. Kennedy boost valve, edge, Modified air intake,EGT & Boost digital gauge,TransferFlow combo fuel & tool box, Air Lift Suspesion Bags Rear & compressor with remote, Bilsteins front & rear, Frontier front replacement bumper.

  17. #17
    Join Date
    Sep 2006
    Location
    British Columbia
    Posts
    2

    Default ickyray

    The poll can be misleading, there are different axle ratios which will affect the mileage noted. I just pulled a 24 foot TT through the Rockies for 1400 miles and average 15mpg imperial. Kept to highway speeds plus 10 over, nobody was waiting for me! Truck has 3.73's and 4X4.

  18. #18
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,589

    Arrow

    Quote Originally Posted by ickyray
    The poll can be misleading, there are different axle ratios which will affect the mileage noted. I just pulled a 24 foot TT through the Rockies for 1400 miles and average 15mpg imperial. Kept to highway speeds plus 10 over, nobody was waiting for me! Truck has 3.73's and 4X4.


    All Duramax equipped light trucks are available with only the 3.73. Any other ratio would have to be owner installed. The 8.1L and 6.0L gassers have the option of 3.73 or 4.10. Tire size changes will effect mileage, though. 10 over with trailer in tow, and no paper trail??
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  19. #19
    Join Date
    Dec 2004
    Location
    Texas
    Posts
    683

    Default

    Yesterday at the station I was adding my fuel supplement and started to pump diesel and two guys walking to their truck made a comment. That won't help it will still only get 13mpg. I glanced at his truck it was a chevy gasser.
    I told him I have an average of 18.58 for a 100, 000 miles now and not all of that is easy driving. I've towed some pretty heavy loads. He said oh, you got the Duramax, took a big gulp of his Coors Light and said come on Joe lets go.Got in his truck and drove off. I don't think he believed me, or else he was kicking himself for not driving a diesel.
    02 2500HD LT D/A SB CC 4X4 BLACK, Westin stainless nerf bars, BW GN Hitch,Racor 60S post oem fuel filter, Oil Guard bypass engine oil Filter. All synthetic fluids. Kennedy boost valve, edge, Modified air intake,EGT & Boost digital gauge,TransferFlow combo fuel & tool box, Air Lift Suspesion Bags Rear & compressor with remote, Bilsteins front & rear, Frontier front replacement bumper.

  20. #20
    Join Date
    Jan 2005
    Location
    Texas
    Posts
    1

    Cool

    2001 4x4 HD ext cab. 275 tires got 19 to 21 mpg. 200100 miles. Injector pump @ 25000m, water pump at 100,000m. just traded 3 weeks for a NBS GMC 6.0 gas 6-speed and traded yesterday for NBS DURAMAX.....Should have known better........but I'm old and allowed to make misteakes....
    Chevy-D

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