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Thread: LBZ Fuel Mileage

  1. #61
    Join Date
    Dec 2004
    Location
    Waukegan, Il
    Posts
    28

    Angry

    Took a 460 mile trip with my dirtbike in the back @65-70mph 18.8mpg. 3500 on the truck now. Usld may be hurting it a bit. really bummed it didn`t get over 20 on this trip
    06 GMC Sierra 2500hd D/A-CC/LB 2wd Silver Birch,Linex bed liner,splash guards,Weathertech vent shades,floor liners, GM bug deflector,Draw-tite intella stop brake control,HIR high/low beams.Amsoil BMK-17 dual remote by pass oil filter, funmoto drain valve,ScangaugeII.Isspro A-pillar gauges,Nictane fuel filter kit

  2. #62
    Join Date
    Nov 2006
    Location
    Ontario
    Posts
    29

    Default

    Quote Originally Posted by up@12
    I have 35,000km on my 06 duramax and am getting 17-18 mpg but was getting alot better when I first got the truck. I think I need to beat on it for a bit. LOLOL
    Sorry I am getting 14.6 MPG I typed the wrong thing. But in saying that last night I took out my AFE filter and put in my stock filter and with the AFE filter I was getting about 122km to a quarter tank now with the stock filter I have 122 km and it has just moved off the full mark. Anyone else ever have this?

  3. #63
    Join Date
    Dec 2004
    Location
    Waukegan, Il
    Posts
    28

    Thumbs up

    Best week yet! 19.3 no highway just to work and back
    06 GMC Sierra 2500hd D/A-CC/LB 2wd Silver Birch,Linex bed liner,splash guards,Weathertech vent shades,floor liners, GM bug deflector,Draw-tite intella stop brake control,HIR high/low beams.Amsoil BMK-17 dual remote by pass oil filter, funmoto drain valve,ScangaugeII.Isspro A-pillar gauges,Nictane fuel filter kit

  4. #64
    Join Date
    Dec 2004
    Location
    Denver
    Posts
    13

    Default

    Does anybody know what the gas engines get for mpg? With diesel costing over 50 cents more per gallon it's tempting to look to the underpowered option.

    DZ

  5. #65
    Join Date
    Dec 2004
    Location
    Waukegan, Il
    Posts
    28

    Default

    I got to try a hybred GMC while mine was in for service and used it to go to work for a day. I reset the dic and got 20mpg to work but coming home dropped the average to 18.3. Had the 5.3 with electric assist and was not bad. peppy performance but not as much power as the diesel. Was weird when the motor just shut off at traffic lights. As soon as the brake was released it was running again. the diesel is also less noisy.
    06 GMC Sierra 2500hd D/A-CC/LB 2wd Silver Birch,Linex bed liner,splash guards,Weathertech vent shades,floor liners, GM bug deflector,Draw-tite intella stop brake control,HIR high/low beams.Amsoil BMK-17 dual remote by pass oil filter, funmoto drain valve,ScangaugeII.Isspro A-pillar gauges,Nictane fuel filter kit

  6. #66

    Default

    Just breaking in my 2007. 330 miles on it now. Filled the tank at the half-way mark. In mixed driving and during break-in I averaged 15.8 mpg. A little less than I'd hoped for, but I am sure it will improve as things get seated.

    Can't wait to see how it pulls our toyhauler!

  7. #67

    Default

    Boston to Auburn, Me. 225 mile round trip. 70-80 mph dic says 17.5mpg. i got 2200 miles on my truck so far. 07 gmc cc longbox stock. When i drive in bumper to bumper traffic all week it get 14.50
    2007 GMC CLASSIC CC LONGBOX LBZ/ALLISON

  8. #68
    Join Date
    Dec 2004
    Location
    Waukegan, Il
    Posts
    28

    Angry

    Temps took a plunge around here this week and so did my milage! 15.7 driving in 0 to 20 degree temps last week. The warm-up idling I did while putting the tractor away as I finished work hurt the milage more than the cold I suspect and I won`t be doing much more of that anymore,
    06 GMC Sierra 2500hd D/A-CC/LB 2wd Silver Birch,Linex bed liner,splash guards,Weathertech vent shades,floor liners, GM bug deflector,Draw-tite intella stop brake control,HIR high/low beams.Amsoil BMK-17 dual remote by pass oil filter, funmoto drain valve,ScangaugeII.Isspro A-pillar gauges,Nictane fuel filter kit

  9. #69
    Join Date
    Jan 2001
    Location
    New Hampshire - Live Free or Die
    Posts
    6,057

    Default

    Quote Originally Posted by Barkbuster
    Temps took a plunge around here this week and so did my milage!
    Our distributor started delivering 20% winter mix last week....
    The Constitution needs to be re-read, not re-written!

    If you can't handle Dr. Seuss, how will you handle real life?

    Current oil burners: MB GLK250 BlueTEC, John Deere X758
    New ride: MB GLS450 - most stately
    Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510

  10. #70
    Join Date
    Dec 2004
    Location
    Waukegan, Il
    Posts
    28

    Default

    Haven`t used the truck much since the cold snap last month. I checked tire presures before xmas and all were around 45psi. I reset to 60psi front and 50psi rear and the ride got a little stiffer but the milage got much better! 19.1mpg, my 2nd best tank so far.
    06 GMC Sierra 2500hd D/A-CC/LB 2wd Silver Birch,Linex bed liner,splash guards,Weathertech vent shades,floor liners, GM bug deflector,Draw-tite intella stop brake control,HIR high/low beams.Amsoil BMK-17 dual remote by pass oil filter, funmoto drain valve,ScangaugeII.Isspro A-pillar gauges,Nictane fuel filter kit

  11. #71
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    I need to check my tire psi also. Glad you mentioned it!



    My 07 wants to run at upper 15's at 72mph and upper 17's at 62 mph. I have been playing with ECM tuning and had it running at 20-21+, but the short hops, varied conditions, and warm ups knock me back down opn average. It is definitely encouraging and I see definite gains from tuning, I just need to collect more data and refine the tuning a bit more. DIC appears to be dead nuts on so long as I stay away from the pulse width tables.

    The truck only has a few hundred miles on it so far and I need to get my usual SS cold front for it soon.
    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!

  12. #72
    Join Date
    Dec 2004
    Location
    Texas
    Posts
    683

    Default

    John, do I understand correctly that your EFI Live works with the 07? I thought they were 32 bit processors instead of 16.
    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.

  13. #73

    Default MPG 12,980 lbs Weld Rig

    2006 3500 WT, 1LT, Chassis Cab. 161.5" wheel base, 84" cab to axle, LBZ W/ 6sp Alison, 3.73:1 gears, 215-85-16 with less then 3,000 miles on the clock.
    I just took a 300 mile ride @ 75 mph.. got 12.8 mpg and @ 80 mph got 12.6 mp. I'm happy..
    Last edited by the_croz; 01-10-2007 at 01:13.
    2006 3500 Chassis Cab LBZ, (D) code, 6 sp, 373's Custom 4" S.S. Exhaust, Weld Rig.

  14. #74
    Join Date
    Jan 2007
    Location
    Orange County CALIFORNIA
    Posts
    9

    Cool MPG's

    I am new here only one tank of #2 through the 07 GMC Sierra 2500HD ext cab LBZ motor. All fwy. Buena Park up Cajon Pass to Victorville back to Laguna Niguel. 16mpg DIC 17.5mpg caculated at fillup. avg. speed 70-75. I'm like-n-it !

  15. #75
    Join Date
    Dec 2006
    Location
    Bainbridge Island, WA
    Posts
    28

    Default 21+

    My son in law reported over 21 mpg on a road trip up I-5 from San Diego to Seattle. That's about a 1400 mile run. Crew Cab 4wd long box.

  16. #76
    Join Date
    Jan 2007
    Posts
    115

    Default

    First time I ran a whole tank of fuel through my 07 Classic, Crew cab, long box. Short distances only (nothing over 10km on the highway) lots of cold starts, winter front off and I got 18L/100 on the DIC, but 16.9L/100km hand calculated. I used to do same route with my old truck and a 6.0L gasser and averaged 22.5L/100km. That is 5.6L/100km less fuel used and the new truck isn't even broken in yet. Not bad at all!

  17. #77
    Join Date
    Jul 2006
    Location
    Los Angeles, CA
    Posts
    51

    Default 7500mi and getting 17/22

    I've just passed the 7500 mile mark (270 engine hours according to the computer) in my truck. (purchased almost 8 months ago), and have been seeing progressively better mpg gains.

    I tend to drive about 200-300 miles a week in my truck depending on how many trips to the GFs house I make (shes in laguna beach aka 44miles each way). Depending on how I drive ill get between 16 and 23mpg on the fwy and 12 to 15 on streets.

    upon my last trip to vegas in december I did a test on fuel mileage.

    on the way to: 290mi, avg speed 80-85mph. fuel economy (hand calc) 13.2mpg.

    the way back: 291mi, avg speed 67mph (1800rpm). set the cruise control, even over the cajon pass. fuel economy 22mpg. made it on a half tank....
    (before the pass the dic estimated economy was 23mpg, and its spot on)

    moral of the story. keep it under 75 and save some fuel.

    -Cam
    2006 Chevy Silverado 2500HD Crew Cab (Dark Blue Metallic) 4x4 w/ LBZ, 3LT trim package (Leather, XM, ON-star) - Banks Six Gun with PowerPDA... Purchased 6/29/06 - 46000 miles
    2001 GMC Sierra 1500 Banana Yellow Xcab w/ 5.3L, 110k miles riding on 20" chrome rims & 295/55 Goodyear Eagle LS Tires, ~14-16mpg city


  18. #78
    Join Date
    Dec 2006
    Location
    Louisiana
    Posts
    33

    Default gas milage???

    I have 5,000 miles on mine.....I am not heavy footed, mostly highway driving, usually drive around 70 to 75 mph. I cannot get better than 14.5. It has been the same on all tanks. I am very disappointed.
    I just finished my first long pull. I have done some short ones to properly break in everything. I varied the speed between 55 and 70 during breakin. Pulling a 30ft toy hauler, 10,000lbs loaded, 500 miles. Speed - 65/70. 8.5 MPG!!! I am not happy at all!! Can I hope for better or do I need to make a trip to the dealer to check for a problem?
    2007 Chevy, 2500HD, Crewcab, 4WD, LBZ,SWB.
    Larry

  19. #79
    Join Date
    Oct 2002
    Location
    USA
    Posts
    1,248

    Default

    We are just comming up on 1,000 miles on our 07. I am only seeing 10.5 so far just short trips. I was seeing 15.5 and better on our 06 before it got wrecked. I hope this 07 does better. I'll blame it on winter and not being broke in yet. It is identical to the 06 except mpg wise.
    0000000

  20. #80
    Join Date
    Mar 2004
    Location
    Reno, Nv
    Posts
    151

    Default

    Well my DIC shows about 14 in town hand calculated it's 15 on average. Long trip from Reno to Victorville and back DIC showed 21 and by hand it was 22. DIC also shows that I have used about 1 gallon more than what i put in..
    13000 miles 07 CC classic LBZ completely stock.
    Phil
    2007 Metallic Blue GMC Crew Cab 2500HD LBZ Allison. 70K mi, 255/85r16 tires.

    1996 GMC 2Dr 4wd Yukon 190k mi, 3.42 rear end, 265/75r16 tires, 4l80e, 97 cooling mod, D-max fan blade, Hayden Severe duty fan clutch, Autometer Boost EGT Tranny temp, JK's 3.5 exhaust.

    Reno NV.

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