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Thread: `06 LBZ improvement, MPG and power

  1. #41
    Join Date
    Aug 2001
    Location
    Scottsbluff, NE. USA
    Posts
    204

    Default

    Pete,
    I do have the LLY with the 6 speed. Just the last 2 days driving my short distance to work, no towing, I am getting right at 16 mpg. I sold my LMM 2007 partially to get better mileage because I became tired the the regen horrible mileage and the fact that I could not do any real substantive aftermarket mods without getting flashes of check engine messages.
    Mark
    2007.5 GMC SLE 2500 HD LMM **SOLD**
    Owned 2006 GMC Sierra CC LLY/LBZ *2 not a D in SN* 214K Purchased 3/2010
    CC/SB/4x4 Summit White
    Owned a 2002 GMC CC LB7 CC sold with 135K
    Now 2015 GMC Crew Cab Duramax/Allison
    Custom Tool box

  2. #42
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,773

    Default

    Quote Originally Posted by pete m View Post
    Hi Mark, from what I see you have an `06 truck with the LLY motor right?, I, as mentioned got better mileage with my (2) LLY trucks than this LBZ, but can feel the extra power this engine has. I think you have the ability to get even better mileage with yours than I did because my LLY trucks were `05's that had the 5 speed, yours should have the 6 speed which should/could get better mileage due to turning less RPM's, I did notice mine running below 1800 rpm at 69 MPH while towing. I thought with this turning less rpm it would get better highway mileage running empty, but still could not touch either LLY, and the last one was a CC 4X4 dually that weighed a LOT more than my current 2500 HD does. Only thing I have done to my truck is the K&N air filter element, and the Superchips tuner, otherwise its stock.
    Wind is more of a factor than RPM in my experience. I'm sure that there are cases where RPM reduction will help, but the Dmax 5 speed is in a pretty good place as far as RPM goes so the extra OD doesn't make a huge difference. The 06-07 LBZ will run pretty darn close to the 05 LLY MPG, but it takes a good tune and restraint on the part of the driver to get it there...
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
    Superflow Lie Detector in house
    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
    2005 Chev K3500SRW D/A CC Long LT(SOLD)
    2007 Chev K2500 Classic EC Short LT (Sold)
    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

  3. #43
    Join Date
    Dec 2009
    Posts
    36

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    "as far as RPM goes so the extra OD doesn't make a huge difference."


    Then why did they add another O/D to the trans?????????????????????? I was under the impression that it was to add fuel economy.

  4. #44
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,773

    Default

    My guess would be emissions. Both from the tailpipe and noise.
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
    Superflow Lie Detector in house
    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
    2005 Chev K3500SRW D/A CC Long LT(SOLD)
    2007 Chev K2500 Classic EC Short LT (Sold)
    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

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