Best combo for improved MPG, less focus on all-out power - Chevy and GMC Duramax Diesel Forum
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 11-12-2012, 07:56 AM   eBay Motors  #1 (permalink)
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Best combo for improved MPG, less focus on all-out power

So, to describe my truck (yes, I am a complete n00b, but I've been lurking for awhile now)...

My LBZ's engine/trans is stock save for...

-Banks turbo-back with no cat
-EGR block off with electronic finger stick
-S&B CAI
-Banks EGT and boost gages
-BD driver's side exhaust manifold

All the work was done by the previous owner that traded it in to my dealership...I have not touched the truck mechanically, drove it as my demo for almost a month, and bought it Saturday.

I have been getting 15 MPG when adjusting for speedo error (truck has fresh 285/65/18 Silent Armors)...a 14.5 MPG tank included 100 miles of towing 6,500 lbs with my gooseneck horse trailer. I would like to improve MPG...more power is awesome, but less critical than an MPG bump. I like how this "lightweight" regular cab 4x4 hauls ass

It would appear to me my best option is EFI Live through Rob, while adding an AirDog lift pump. Is this accurate? I admit I may take the truck to the track once or twice to see what it will do, but I have 3 Camaros for that stuff

Longevity and MPG are my 2 most important things. Admittedly, the truck is not a DD, and due to its pre-emissions status, I will probably hold onto it for the next 6-10 years, adding 5-7k a year to the 87k it currently has.

Awesome forum, BTW... I have been on several GM forums over the years, and this one appears to me to be the diesel truck equivalent of LS1 Tech, which is a high compliment IMO....
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07 GMC LBZ W/T Reg Cab
-Bright red, 86k, A/C, Allison...and not much else!
-Banks turbo back, S&B CAI, lifted 3" on 285/65/18 KMC XDs and Silent Armors
2000 Camaro SS
-Black, 10k, LS1, 6 speed, T-tops, every SLP option
1997 Camaro Z28 30th Anniversary
-White/Orange Stripes, 74k, LT1, 6 speed, T-tops, bolt ons
1988 Camaro IROC 350
-Grey, 23k, L98, AT, T-tops - Stock and Gorgeous
1999 Wrangler Sport
2004 Grand Prix GTP Competition Group - Wifey's car has got a blower!!
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Old 11-12-2012, 08:09 AM   eBay Motors  #2 (permalink)
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Drive like grandpa, thats one way to help the mpg. If you enjoy the haul ass-ness, you wont enjoy the mpgs, Im in that same boat right now
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04.5 4x4 ~133k miles
DE 4", 5100s, LBZ MP, S&B LBZ air, KoryWillis Go-go Juice, Insight CTS, ADII, 8' Fisher



Dirtymax this, Dirtymax that...
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Old 11-12-2012, 08:38 AM   eBay Motors  #3 (permalink)
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Here's a little tip, pay attention to your EGT gauge.

Keep the egts as low as possible as often as possible. The more fuel you burn, the hotter the exhaust gets.
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2003 Lb7 2wd
Dropped
Efi Live by Rob Coddens
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Old 11-12-2012, 08:39 AM   eBay Motors  #4 (permalink)
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EFI Live will help with the mpg's quite a bit
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2004.5 LLY ECSB 4X4
EFI Live
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Need more Air and Fuel
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Old 11-12-2012, 08:39 AM   eBay Motors  #5 (permalink)
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^ true story
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Old 11-12-2012, 08:48 AM   eBay Motors  #6 (permalink)
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If you already have an exhaust, egr blocker, and intake. EFILive is defiantely the next step and will net you the most MPG gains!

let me know if i can help get you into some Idaho Rob tuning
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Blackout :06 GMC lbz 4x4 Built motor, HSP twins, DDP Injectors, Self built trans 11.68@118.5
Over Built :07 Chevy lbz 4x4 Caged and built 10.42@134
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Special thanks to: Mike L, Gtrippin, IdahoRob, Dmaxstore, HSP, ISSPRO, Yukon, Airdog

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Old 11-12-2012, 11:58 AM   eBay Motors  #7 (permalink)
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Before I do EFI Live, do I need a new lift pump? Reading archives, there appears to be some argument on that...
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07 GMC LBZ W/T Reg Cab
-Bright red, 86k, A/C, Allison...and not much else!
-Banks turbo back, S&B CAI, lifted 3" on 285/65/18 KMC XDs and Silent Armors
2000 Camaro SS
-Black, 10k, LS1, 6 speed, T-tops, every SLP option
1997 Camaro Z28 30th Anniversary
-White/Orange Stripes, 74k, LT1, 6 speed, T-tops, bolt ons
1988 Camaro IROC 350
-Grey, 23k, L98, AT, T-tops - Stock and Gorgeous
1999 Wrangler Sport
2004 Grand Prix GTP Competition Group - Wifey's car has got a blower!!
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Old 11-12-2012, 12:13 PM   eBay Motors  #8 (permalink)
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not necessarily.
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Blackout :06 GMC lbz 4x4 Built motor, HSP twins, DDP Injectors, Self built trans 11.68@118.5
Over Built :07 Chevy lbz 4x4 Caged and built 10.42@134
The Car: 2014 Chevy Cruze 2.0 Diesel
Special thanks to: Mike L, Gtrippin, IdahoRob, Dmaxstore, HSP, ISSPRO, Yukon, Airdog

LIKE US ON FACEBOOK!
Adrenaline Truck Performance IDAHO ROB 208.685.1000
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Old 11-12-2012, 01:03 PM   eBay Motors  #9 (permalink)
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naw. you will need one if you are getting built tranny tunes. but at that point you could be kissing mpg goodbye due to a heavy foot.

a lift pump is nice for keeping your fuel clean tho
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Old 11-12-2012, 04:02 PM   eBay Motors  #10 (permalink)
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Thanks for the expert opinions I believe the less I mess with things, the less likely I am to have an issue. Something with a 50-75hp tow tune that gives a small improvement in fuel mileage, and has a non-towing tune with a good bump in MPG, is primarily what I am looking for. I know keeping my foot out of it will help a ton, as well. Its so hard to do!

I can't imagine ever going over a 75hp bump unless I had something to prove at the track :lol: I will be doing some additional EFI Live research, then will contact vendors through here. If all I need to do from here is add EFI Live, that is huge...thanks for the help!
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07 GMC LBZ W/T Reg Cab
-Bright red, 86k, A/C, Allison...and not much else!
-Banks turbo back, S&B CAI, lifted 3" on 285/65/18 KMC XDs and Silent Armors
2000 Camaro SS
-Black, 10k, LS1, 6 speed, T-tops, every SLP option
1997 Camaro Z28 30th Anniversary
-White/Orange Stripes, 74k, LT1, 6 speed, T-tops, bolt ons
1988 Camaro IROC 350
-Grey, 23k, L98, AT, T-tops - Stock and Gorgeous
1999 Wrangler Sport
2004 Grand Prix GTP Competition Group - Wifey's car has got a blower!!
Jason E is offline   Reply With Quote Quick reply to this message
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