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Thread: LBZ Fuel Mileage

  1. #121
    Join Date
    Jun 2007
    Location
    oxford me
    Posts
    162

    Thumbs up lbz milage

    put about 4000 miles on the 06 cc short bed with lbz. every tank checked by the dic and hand calced as well. dic says anywhere from 17.5 to 18, actual hand calc says always a 1/2 mile per gallon better, so around 18 to 18.5. most of its miles are the wife driving it back and forth to work 40 miles round trip,so not really long enough to let it strech its legs. i have seen the truck get 21 mpg at best.havnt towed with it yet and it still isnt broke in yet(19000 miles)love the truck happy with the mpg
    #1 01 dmax xcab 251000 miles and climbing
    #2 06 dmax crew cab 66000 miles 2009 polaris dragon 800sp 89 suzuki 500 quadracer

  2. #122
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    If I drive sensibly and run at 62mph mine has been rewarding me with 22mpg and sometimes a shade over. Much better than the upper 17's that I started out with. If I make numerous stops it does start to fall. It likes to get up to temp and stay there. It's taken a lot of tuning to get it there. I believe it's partly the tuning, and partly the break in. I now have about 8k on the clock if memory serves.
    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. #123
    Join Date
    Oct 2002
    Location
    USA
    Posts
    1,248

    Talking

    My mileage seems to be getting better as time & miles add up. I just towed our 40 ft LQ Horse trailer weight 14.5k without horses on a 400 mile round trip to the beach. We averaged 10.2 mpg hand calculated. There was some stop & go traffic. According to the computer our best mpg was at 62 to 65 mph. It seemed to drop more at 55 ? Tried to keep it in 6th gear when I could.It was actually saying 12.9 at 62 and above for some stretches. 5,400 miles on truck so far.
    0000000

  4. #124
    Join Date
    Jul 2007
    Location
    ortonville, mi
    Posts
    133

    Default

    just took a trip with mine and NO trailer, and about 8500 miles on the clock now...
    one tank was 19.5 w/ my calculator, the other tank I got 21.3
    http://www.thedieselpageforums.com/tdpforum/image.php
    07 GMC CC SB LBZ
    70 monte carlo, original 4 spd, bench seat
    71 monte carlo SS clone, street/strip
    97 grand am, beater

  5. #125
    Join Date
    Jan 2007
    Posts
    115

    Default

    Took a trip to the valley few days ago and got anything between 10.8 and11.1 L /100km that is about 21mpg, running on the highway @ 65mph constant. Didnt matter if empty or loaded with 300kg. Got 13000km on the clock now. So far the milage on my Duramax is still improving. It does make a difference running with the air conditioner on or off, also running 6th gear over 90km/h. So far I am really happy with that, as I used to get 12 to 14 mpg with my old 6.0L 2500 YukonXL.
    07 Chevrolet Classic, CC, regular box, Duramax Diesel, Magnaflow dual exhaust and Superchips tuned.

  6. #126
    Join Date
    Oct 2002
    Location
    USA
    Posts
    1,248

    Thumbs up

    Iv'e noticed our mpg is improving running empty about 14 to 16.3 around town & country and 18.6 on hwy. We just turned over 8,000 miles. It has come up since it is getting broke in.
    0000000

  7. #127

    Default Poor mpg

    New to the board and I am seeing only 12-14.5 with my LBZ 2007 classic 4x4short bed crew cab 20,000 miles and a 3.73 rear looking for upgrades to increase mpg what is out there that is working.
    I did get 18 on a 300 mile trip it needs to get better than 14 any help out there. Average load 2000lbs. when towing that is when I see 12-13 mpg.

  8. #128
    Join Date
    Oct 2002
    Location
    USA
    Posts
    1,248

    Default

    Stop and go traffic and any will knock it down quite a bit. I have seen as bad as 13.5 empty when around town.
    0000000

  9. #129
    Join Date
    Apr 2007
    Location
    Calgary, Alberta
    Posts
    17

    Default latest mpg report

    2 trip's now for work through BC mountains on # 1 hwy: Calgary to Kelowna
    Avg 60-65 mp/hr...avg mpg both trips was 19.8 , and ya I use the DIC...I use it all the time. I also hand calc. and it is out no more than .5 - so whatever.

    This is 2 lane mountain driving...Kicking Horse pass, Golden, Rogers pass, Revelstoke etc. some serious ups n downs.!

    Truck was MT other than suitcase/laptop, cpl of spools of FCAWire and 4 Jerry cans of Diesel. (way cheaper in Calgary than on the Hwy. (.40-.70cents/gal). no wind, Banks on level 4 running stock tires.

    Truck has just about 63,000 miles (102,350km). Still purrrrin.!..it will get better but I do think these units need to be worked once in a while..tow a good haul or load up the bed with some weight and drive with it for a while.

    cheers,

    stk
    06 LBZ CCSB Blanco:
    SS Nerfs, Spray Liner, Banks 6 Gun PDA (Pyro - Pre turbo), AFE TurboBack Exhaust (Quiet like with a nice whistle..!!), AFE Air Filter (stock OEM is best), Sirius on 14/103, FS2500 Oil ByPass, EGR Blocked and "Fingered", Reese Brake controller, Transgo Jr. & BD Deep Ally Pan, Stanadyne Secondary Fuel filtration: FM100, New ISS, All headlight on Mod (dead simple), BioD for an additive, stock 245's - good for mpg.!

    I support the troops, the mission: CANADA In Afganistan

  10. #130
    Join Date
    Nov 2007
    Location
    Ishpeming, Michigan (Da UP)
    Posts
    7

    Default 07 Classic CC-SB LBZ Mileage

    My 07 Classic Crew Cab - Short Box - LBZ is stock right now - stock tires too and I have about 18,800 miles on her. I make repeated 3 hour trips back and forth in northern Michigan (in the U.P. - the REAL Great White North) and while they are not considered highway, I get decent fuel mileage. Since about the 10K mile mark I have been consistent with 19.6 to 20 mpg on this 3 hour trip running about 65 mph. I pass through small towns and have to slow down and because I have a wife and 2 small kids, we have to stop every friggin hour - but I am pleased with that mileage. Beats the hell out of my mini-van years.

    Around town - it really varies. I get between 14.5 and 16.5 mpg depending if I am rodding it at all. Its not my daily driver, so I tend to like to RUN IT when I do drive it.

    Winter blend DOES change this mileage - maybe 1.5 mpg or so. (ALL of this is hand calculated)

    And really - who BUYS this truck for "mileage" anyway?

    Its just a friggin awesome truck. LOVE the DMAX and ALLISON.

  11. #131
    Join Date
    Nov 2007
    Location
    Tulsa, OK
    Posts
    7

    Default

    My '05 had 40k on it when I bought it. I stole this truck for 27k. LT Fully loaded CC 4WD and all the bells and whistles. I dumped an injector at about 50k shutting down the left bank. Recall thank gawd! Before this happened I was happily getting 17 avg. Since I have gotten the truck back I have not broke 14! What the he$$ is going on??? Can someone tell me? I would also like some input regarding the Hypertech Programmer III. I was told that this was the application for my truck. I travel around 60k miles per year. I need the fuel mileage. Any help or suggestions??
    '05 CC 4WD "Duallie" LT Loaded D/A
    '94 7.3 Turbo, not PSD Ex-Cab 5 spd "Duallie"
    '03 Silverado Ex-Cab 5.3
    '66 Ford Short Bed 6/3 on the tree

  12. #132
    Join Date
    Jan 2008
    Location
    Edgewood, NM
    Posts
    1

    Default Fuel Economy

    I have a 2006 LBZ and have approz 25000 and only just got over 18 mpg after putting in a banks ram air systems before I was averageing 16 mpg. Most of my driving is 70 miles daily with 60 highway and 10 intown at around 75 mi. Does this sound right? I love the truck though came from a F250 V-10.

  13. #133
    Join Date
    Jan 2005
    Location
    Idaho
    Posts
    1

    Default

    I'm getting around 16 city and 19 highway

  14. #134
    Join Date
    Sep 2006
    Location
    Skippack PA
    Posts
    25

    Default

    27500miles. Suburban type driving 14.5 - 16.5
    High way loaded and gunn'in. 18.5
    high way and keep'in my foot out of it ( 1800 RPM'S) 22-23.5

    Powerplant Kick's a$$. Stock and I can beat/ control situation most of the time:

  15. #135
    Join Date
    Sep 2006
    Location
    Skippack PA
    Posts
    25

    Default

    March 11, 08
    LBZ/ see prior post
    winter mix same type driving
    Last two fill ups(21 gallons +/-
    15.3/15.7
    Last Fill up was @ $4.06 WTF

  16. #136
    Join Date
    Mar 2000
    Location
    bayville, new jersey, USA
    Posts
    280

    Default

    last couple tanks for me,
    hess diesel
    hanging in at 17mpg.
    but i think the fact lowering the speed limit on 1/3 rd of my parkway commute has helped

    just added a bully dog pup programmer. like to see what happens now !
    '12 gmc sierra 2500 dmax slt carbon black.
    '12 s350 diesel mb
    '10 mazda 6i, for sale
    '77 450sl benz, in family since new, sold, still in jersey thou
    '91 350sdl benz, 3.5l diesel, 28 mpg
    '90 560sel benz

  17. #137
    Join Date
    Feb 2000
    Location
    Maplesville, AL - Home Base
    Posts
    536

    Default

    Even though it was hard to do, I drove to the lake Thursday evening at 65 mph while on the interstate and 62 on the two lane roads just to see how the mileage would change from my usual 75 mph interstate and still 62 on the two lane sections. This trip is a total of 210 miles and 80% is interstate. I did not have the a/c on. On arrival at the lake the DIC had been steady on 21.0 mpg for over 10 miles with no change. It is usually slightly conservative on my truck, so I feel certain I was getting 21.0 or maybe just a tad more. I won't know for sure until I fill up on the way back home this afternoon and hand calculate it. I usually see about 16-17 mpg in town, but then I have a very light foot (I get honked at pulling away from red lights all the time).

    Maybe I'm just lucky and got a truck that can produce good efficiency, or maybe my conservative driving is the major factor. Whatever the cause or causes, I'm glad to see this kind of efficiency, but I'm the first to admit it is hard to not punch it occasionally. Ed
    Ed
    KM4STL

    '06 Sierra LBZ 4x4 Crew SB, Titan 52 gallon fuel tank, TTT/Schefenacker Mirrors
    '98 Suburban, 245,000 - sold 7-4-06

  18. #138

    Default

    Hey all.. I have a 06 GMC short bed with a little over 20000 miles on it. Last summer and early fall I was getting just shy of 23 MPG on the highway. Running between 70-75 mph. I went up from the factory size tires. From 245-16 to 265-16. I didn't pay that much attintion to the milage after that. Then in October I went on a trip. From WV to WY on a hunt and visit. My milage on the highway was 16.3 at best. Now, running around town and such is 12.5 at best. What in the world happened to my milage.
    The service guy at the shop told me it was because I changed the size on the tires. I just can't believe that 1 size would cut my milage that much.. Any help would be appriciated.

  19. #139
    Join Date
    Jan 2001
    Location
    New Hampshire - Live Free or Die
    Posts
    6,057

    Default

    Did you adjust the speedometer to compensate for the tire change?

    23 mpg at 75 mph sounds a little fishy to me. Are you sure? Was that by the DIC or calculated?
    The Constitution needs to be re-read, not re-written!

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  20. #140

    Default

    No, I did not adjust the speedometer for the bigger tires..
    And as for the MPG. It was just shy of 23mpg and I got it off of the DIC and I calculated it also.

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