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Duramax 6600 Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

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  #81  
Old 11-28-2009, 11:40 AM
pamax pamax is offline
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Join Date: Sep 2001
Location: Northeast, PA 16428
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Wink LMM Fuel Economy

I have a 2009 Crew Cab HD2500 with 587 miles and I am getting up from 14.6 new, to now reading 15.2 on the computer. My 01 would get a solid 17 on the same trip running at 60 mph. So far can not tell if it went through regen or not but the tail pipe stays clean.
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  #82  
Old 01-21-2010, 06:56 PM
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WyoDutch WyoDutch is offline
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2009 3500 4X4 Xtended cab SRW. Running 1/2 ounce of Opti-Lube XPD per gallon of fuel.

19MPG, running our 65mph speed limit over all sorts of terrain.
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  #83  
Old 01-27-2010, 09:54 PM
havenopower havenopower is offline
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My 2004 gets like 10mpg with all the mods but my 2006 lbz gets no better than 12mpg in town stock with no cat of muffler. tried a super chip junk
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  #84  
Old 02-07-2010, 09:13 AM
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WyoDutch WyoDutch is offline
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Default Getting better

At the 6,000 mile mark:

Non-synthetic motor oil
8 ounces of Opti-Lube XPD per 40-gallon tank of fuel
No bed cover or other addons.

Just did a run to Texas and back (3,200 miles). Drove the speed limt... ranging from 55mph to 75mph. The last 400 miles, had 500 pounds of bagged corn in the back.

Overal mileage came in at 18mpg for the trip.

I'm pleased.
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  #85  
Old 02-07-2010, 11:23 AM
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EdHale EdHale is offline
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I drove from Atlanta to Titusville, FL yesterday (475 miles). All interstate and all at 75 mph and my mileage was 36-37. Seriously.

Oops! Wrong vehicle. I was driving a 2007 Chevrolet Cobalt.
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'06 Sierra LBZ 4x4 Crew SB, Titan 52 gallon fuel tank, TTT/Schefenacker Mirrors
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  #86  
Old 02-24-2010, 08:28 AM
ororke1 ororke1 is offline
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I got 19.5 mpg on a recent trip with my 09 Siverado. 6000 miles on it, 68 mph empty. Around 15 local driving.
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2009 Silverado 2500 HD Crew Cab D/A LTZ
Western 8' Poly Pro Plow with wings, Luverne SS Running Boards, Weatherguard Alum. Tool Boxes, WeatherTech Floor Liners, Stampede Wind Deflectors, Line X Spray In Bed Liner


1985 CUCV Blazer with 6.2 Dsl
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  #87  
Old 03-08-2010, 08:40 PM
nomad03 nomad03 is offline
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Question

I will get 17-18 hiway at 75 with no trailer in tow, if I am pulling ANY trailer from a small utility to my 29 foot rv my mileage will drop to 8-11. I am not very inpressed with my towing mileage. Power is great.

I am running 285/75/16 and have had GM reproram the system, also a K&N air filter, and a supper chip programer. I can set the programer on any setting and it will not effect my mileage.

I have 25k miles on the truck.
is this nomal mileage for this truck?

2007.5 LMM
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  #88  
Old 03-09-2010, 07:17 AM
richp richp is offline
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Location: Geneva, IL
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Hi,

A couple of weeks ago, I did Chicago to near Grand Junction, CO, with my '09 LMM.

Actual calculated fuel economy on the last two legs of this trip (topper on truck, cruise control on 65, short stop-off tooling around in Denver), was right at 20 mpg. I know from prior trips that running without the topper costs me about 1.5 mpg on this same route.

FWIW.
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2019 K-2500 Crew Cab Z71
Cedar Creek Silverback 33RL Fifth Wheel
In The Past: '82 6.2 Jimmy Blazer, '93 6.5 GMC K-2500, '01 DMAX K-2500, '09 DMAX K-2500
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  #89  
Old 03-13-2010, 07:08 AM
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Chevy Boy Chevy Boy is offline
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Default MPG Calculator

I been using this Excel file for 5 years now with some modifications and it works really good and it's accurate..........been averaging 19.6 mpg on my 2007 Silverado LT 1500 over a 3 years period.

http://www.uklegacy.com/forums/index...e=post&id=2651
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  #90  
Old 03-13-2010, 08:06 AM
Runaway_Dmax Runaway_Dmax is offline
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Quote:
Originally Posted by nomad03 View Post
I will get 17-18 hiway at 75 with no trailer in tow, if I am pulling ANY trailer from a small utility to my 29 foot rv my mileage will drop to 8-11. I am not very inpressed with my towing mileage. Power is great.

I am running 285/75/16 and have had GM reproram the system, also a K&N air filter, and a supper chip programer. I can set the programer on any setting and it will not effect my mileage.

I have 25k miles on the truck.
is this nomal mileage for this truck?

2007.5 LMM

I do not believe your dealer can adjust a DMax truck to your tire size - the ABS system yes they could, but for speedo - no.

If you still have the DPF in place, your programmer is causing the truck to regenerate more often and will result in lower mileage.

Your K/N filter is a big no-no for diesels. Yes it may allow more air into system, but more dirt as well. There have been independent tests done that show the stock air filter does the best at stopping dirt.

My truck is an 08 CC/long box and its hovers between 18 - 19 mpg and towing my 28 ft fw and atv trailer in tandem 10 - 12 mpg. I hit the magic 20 mpg mark once in the 38K I have owned the truck.
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08 Blue Granite Silverado LTZ, DMax/Ally, CC/LB/4x4, Cab lights, Camper mirrors, Brake controller, Sunroof, Park assist, and skinny tires

06 Jetta TDI

00 Jayco 263RK (2nd home)

upgraded to an "09" Ranger 619VS/full windsheilds, w/an ETEC 225HO, T8 kicker, Minnkota 101 Terrova, and Lowrance electronics.

Real Trucks have LONG BEDS!
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  #91  
Old 04-02-2010, 03:06 PM
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BMDMAX BMDMAX is offline
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Talking LMM Round Trip Report - Atlanta, GA to Loyal, WI

I recently completed a round trip from Atlanta, GA to Loyal, WI to pickup my LB7 race engine from Kennedy Diesel. We burned 105.4 gallons of diesel over 2,137.2 miles for a trip average of 20.27 MPG. The highest leg was 21.0 MPG and the worst segment was 18.8 MPG. All cruise speeds were 73 to 78 with some bursts in the 80's. The 18.8 segment was bumper to bumper rush hour traffic in ATL.

All mileage was hand calculated.

This was with the KD Tow Tune ECM and DPF delete with the KD four-inch exhaust. Everything else is stock on my 2008 LMM. Very happy with the KD tuning on the LMM.

I highly recommend the KD tune for those wanting to bump up their mileage on their LMM.
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2002 LB7 D/A 2WD. Suncoast Stage V. KD EFILive Tuned, KD N2O, KD 40 Over Injectors, MDP Custom Fuel System, KD MEGA Filter, BD Turbo

2005 LLY D/A 2WD. KD Headlight Booster, KD 4/5 Exhaust, Suncoast Stage V, KD EFILive Tuned.

LB7:12.8@108 #2 Only 11.92@115.62 #2W/N20
LLY: 471HP & 990 TQ 13.58@100.57

[URL=http://www.youtube.com/watch?v=mH_RfHGgKUk]Boosted![/URL]

[url="www.bmdmax.com/index.html"]Truck Website[/url]

[URL=http://www.bmdmax.com/downloads/semc-2.wmv]Chasing 11's Video[/URL]

[url="www.kennedydiesel.com"]Go Fast Goodies Powered by Kennedy Diesel[/url]

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  #92  
Old 12-26-2010, 05:42 PM
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crazydave01 crazydave01 is offline
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Default Disappointed to say the least !

08 GMC CCSB. Front leveling kit only, 305/50/20 tires(actual height is 32")

Best tank on highway 14.8
Avg highway 13.9
Avg local 12

Hauled my motorcycle trailer today and got 8.2 MPG. It only weighs 4000 loaded. My 06 silverado with a 5.3 got 10 MPG everytime on the same trip, same trailer.

Diesel fuel 3.399 gal = very expensive and disappointing.

All mileage figured by GPS and amount of fuel pumped at the station. The DIC shows worse mileage than actual.

KD ECM on the way. Hopefully it helps
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-Kennedy ECM
-Magnaflow 4" Turbo back off road exhaust
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  #93  
Old 05-08-2011, 10:05 AM
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FYRWOOD GUY FYRWOOD GUY is offline
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my 2011 3500HD with the break in oil still in motor at 2560 miles is telling me via the dic that fuel mileage is 14.8 and seems to be climbing during this break-in time. i am going to run mobile devac elite synthetic diesel motor oil. i guess i should start keeping track of mileage the old fashioned way after i dump the break-in oil.





would like to read about other 2011's
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  #94  
Old 05-08-2011, 06:54 PM
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Mark Rinker Mark Rinker is offline
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Great looking rig...nice chainsaw/logging website!


www.MREBoatTransport.com
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2011 Chevrolet Tahoe 5.3L daily driver
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
  • Total GM diesel miles to date : ~950K
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  #95  
Old 05-08-2011, 06:55 PM
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JohnC JohnC is offline
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Quote:
Originally Posted by crazydave01 View Post
Diesel fuel 3.399 gal = very expensive
Ah, for the good old days!
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Current oil burners: MB 350SDL, Kubota 7510
Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6
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  #96  
Old 01-20-2013, 07:50 AM
prairiewind prairiewind is offline
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Location: Wellington Colorado
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I have owned a 2002, 2004 and now 2008 3500 HD. Got 17 to 19 in first two. I have 72,000. on the 2008, got 17 when first purchased, now 12 to 14. When I take to dealer and they reflash I can get 19, this will las for a few tanks of fuel then back to 12 to 14. I can put my auto zone tester on and there will be no codes, I reset codes, even though there are no codes, and I go back to 18. I would like to put an edge cts and an exhaust brake on but would like to figure out what is wrong before I do anything. Dealer has no idea.
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  #97  
Old 01-20-2013, 07:58 PM
DieselDavy DieselDavy is offline
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Are you hand calculating?
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Dave's Diesels:
Sold June, 07 '82 1/2 ton 4X4;340k miles
'97 2 Dr Tahoe, Intercooled,
Kennedy ECM, 4" Exhaust
'02 GMC
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  #98  
Old 01-21-2013, 06:58 AM
prairiewind prairiewind is offline
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Yes, mostly, I pretty much use this truck for trips, I can look at the fuel guage and the milage and tell what is going on. Last summer I had the fuel system cleaned and they reflashed at the same time. I made several trips pulling a 4 horse slant and got 13, a couple of months later I made the same trip empty and got the same, 13. I went back to the dealer and another reflash and back to 17 to 19 depending on how I drove. These trips are over I70 from Denver to Page AZ. I also have a 30' Montana and when everything is running right I can get 10 to 12 when in my lame mode I get 6 to 9. When I started resetting my codes, even though they don't show up it doesn't make a difference right away but after a couple of hundred miles I can actually feel the truck respond. The truck goes from sluggish to very responsive, you know exactly when it happens
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  #99  
Old 01-24-2013, 06:38 AM
prairiewind prairiewind is offline
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I was sure hoping someone could let me know if they had the same problems, have tried to reset, anything.
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