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Go Back   Chevy and GMC Duramax Diesel Forum > Chevy / GMC Duramax 06-07.5 LBZ & LLY Forums > 06-07.5 LBZ & LLY Duramax Powertrain
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06-07.5 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

 
       

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Old 06-29-2009, 11:24 AM   eBay Motors   #1 (permalink)
sunnysideautomotive
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Only Getting 12.7 MPG any ideas guys

Only Getting 12.7 MPG any ideas guys
2006 2500hd
Volant cold air intake
4inch exhaust no cat
Bullydog outlook
New fuel filter
New oil

only getting about 260 miles a tank.
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John C
2006 2500hd
Volant intake
Transgo Jr
4 inch turbo back exhaust.Royale purple in diffs
Bullydog outlook with shift on the fly
Heavy right foot installed at birth
snugtop canopy with remote open.30ft trailer weighs about 8k pulling it at 70mph getting 11 mpg
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Old 06-29-2009, 11:26 AM   eBay Motors   #2 (permalink)
Hondarider552
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That "heavy right foot installed at birth" is the cause
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Old 06-29-2009, 11:31 AM   eBay Motors   #3 (permalink)
BigGrnJeepTug
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Quote:
Originally Posted by Hondarider552 View Post
That "heavy right foot installed at birth" is the cause
along with the "30ft trailer weighs about 8k pulling it at 70mph getting 11 mpg"
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KILLERBEE Designed Intake piece- Everyone needs one of these!

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Old 06-29-2009, 11:32 AM   eBay Motors   #4 (permalink)
RedBowTies88
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i agree with Brian. but also what are you running that bullydog on?

maybe if you foot is quite heavy (as is mine) you would actually benefit from keeping that on a really low setting unless your doing highway cruising.

i found doing that worked the best when i only had my banks

also check out your air filter unless its one of those new fancy ones it may need a good cleaning
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LLY Cc/sb 4x4 RED

Quote:
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right they just show n' shine aint spoolin that turbine
Quote:
Originally Posted by McRat
I think the Cummins guys are already datalogging in a very sophisticated manner:

"Heck Bubba, they ain't much smoke, I still sees the sun!"

"You right Jimbo, needs some of them .090" x 6 sticks prolly."
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Old 06-29-2009, 11:33 AM   eBay Motors   #5 (permalink)
D.W.
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maybe check tire pressures, air filter for cleanliness, you have a new fuel filter, has this been going on for a while, maybe bad batch of fuel in the tank
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2005 Chevrolet 2500HD crewcab LLY, LT3 package
Banks 4" Monster Exhaust, S&B cold air intake, Kodiak mouthpiece and MBRP cat delete pipe
B&W turnover fifthwheel, Pac-brake air springs
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Old 06-29-2009, 12:03 PM   eBay Motors   #6 (permalink)
wannabefastcrf
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i would jack it up and spin the tires, make sure nothing is dragging (brakes, bearings, ect)
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Old 06-29-2009, 12:05 PM   eBay Motors   #7 (permalink)
sunnysideautomotive
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Air filter is clean /Tires full. And I was driving it to see what it would get for MPG no hot footing. I know it should be getting atleast 16mpg
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John C
2006 2500hd
Volant intake
Transgo Jr
4 inch turbo back exhaust.Royale purple in diffs
Bullydog outlook with shift on the fly
Heavy right foot installed at birth
snugtop canopy with remote open.30ft trailer weighs about 8k pulling it at 70mph getting 11 mpg
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Old 06-29-2009, 12:07 PM   eBay Motors   #8 (permalink)
Ironman070809
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do you do a lot of stop and go driving....i know when i am in the portland area like i am now i only get about thirteen so dont feel too bad
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Old 06-29-2009, 12:07 PM   eBay Motors   #9 (permalink)
1953drtelco
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Is your mileage hand calculated, or are you using the computer estimate?
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LBZ mouthpiece upgrade
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Old 06-29-2009, 12:14 PM   eBay Motors   #10 (permalink)
sunnysideautomotive
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O and I do get an EGR code for lack of flow.
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John C
2006 2500hd
Volant intake
Transgo Jr
4 inch turbo back exhaust.Royale purple in diffs
Bullydog outlook with shift on the fly
Heavy right foot installed at birth
snugtop canopy with remote open.30ft trailer weighs about 8k pulling it at 70mph getting 11 mpg
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