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| 07.5+ LMM 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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08-23-2007, 05:10 PM
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eBay Motors
#11 (permalink)
| | Junior Member
Join Date: Jun 2007
Posts: 6
| Got back from trip, 21.7mpg at 67mph, bit of a tailwind, no major hills, mileage at 2900, still using power service diesel clean additive.
2007.5 LMM 4wd CC. | 
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08-26-2007, 05:40 PM
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eBay Motors
#12 (permalink)
| | Member
Join Date: Sep 2006 Location: Dennison, Ohio
Posts: 31
| I was getting 15.7mpg empty and 8.8mpg with the truck and trailer. I just cut out the fins in the air box and the last trip I did I got 18.2mpg. The 15.7 mpg was one day before I cut the fins out. The truck has 500 miles on it. | |
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08-26-2007, 06:14 PM
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eBay Motors
#13 (permalink)
| | Member
Join Date: Aug 2007 Location: tennessee
Posts: 56
| what are you talking bout cutting the fins out? | |
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08-26-2007, 06:52 PM
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eBay Motors
#14 (permalink)
| | Member
Join Date: Sep 2006 Location: Dennison, Ohio
Posts: 31
| Quote:
Originally Posted by jimmarla  what are you talking bout cutting the fins out? |
Take the baffle out of the airbox and cut the fins out, I used a rotozip to do this. The air box just pulls right out. Just have to take the hose clamp off. It really works.
__________________ 07 GMC cc/sb LMM 4x4
DPF & EGR free  tie rod sleeves, Crank it Up center link, weight bar, pulling hitch, traction bars, Trans-go Jr, 4" Magnaflo
EFI Live
Power Max Performance
Duramax Tuners
It will all work out in the end http://www.myspace.com/lawnboy01
Last edited by deeretracks : 03-30-2008 at 06:56 PM.
Reason: Rule 2.12
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08-27-2007, 12:27 PM
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eBay Motors
#15 (permalink)
| | Member
Join Date: Aug 2007 Location: tennessee
Posts: 56
| I cut the fins out today and put a K&N in place of the factory air filter. I hope this will help the mpg.! | |
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08-27-2007, 01:52 PM
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eBay Motors
#16 (permalink)
| | Duramax Forum Moderator
Join Date: Feb 2007 Location: Barnesville OH
Posts: 3,449
| Quote:
Originally Posted by jimmarla I cut the fins out today and put a K&N in place of the factory air filter. I hope this will help the mpg.! | please do your self a favor and install the oem filter again or a AFE,Volant,S&B or a Amsoil filter but anytning but the K&N the reason i say that they allow to much dirt into the turbo housing ruining the bearings and after awhile you will need a new turbo..
__________________ James 
05 LLY Chevy LS E/C L/B DRW my older brothers truck now
2006 LBZ GMC SLE C/C S/B,sold the truck to my dad for a business truck
My Truck now,1987 Chevy 2500 350 tweaked,6" SuperLift,350 V8 bored 60 over,Elderbrock headers Cam and Titanium Rockers,750 Twin Pumped Holley Carb and some other goodies.crank dynos over 400HP. | |
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08-27-2007, 03:02 PM
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eBay Motors
#17 (permalink)
| | Member
Join Date: Aug 2007 Location: tennessee
Posts: 56
| thats good to know, but sucks on the other hand! I wish I would have known that and put that $75.00 towards a good filter. thanks for the info | |
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08-27-2007, 08:10 PM
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eBay Motors
#18 (permalink)
| | Junior Member
Join Date: Jun 2007
Posts: 6
| Yeh, take that K&N out as fast as you can or you will trick, ruin, trash your mass air flow sensor, not only do K&N's not filter good, but they deposit oil all over the mass air flow sensor, screwing up your mileage, throwing codes, etc.. The gasoline rodders experienced that pain several years ago. Like the previous thread said, go with oem or the other none oiled filters. If your K&N has already oiled the mass airflow, there is a specific cleaner for getting the oil off of it. | |
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09-01-2007, 08:23 PM
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eBay Motors
#19 (permalink)
| | Member
Join Date: Aug 2007 Location: Baltimore
Posts: 31
| I have 935 miles on it 16.3 mpg city and some hwy. I'm looking into a tuner | |
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09-02-2007, 05:56 AM
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eBay Motors
#20 (permalink)
| | Junior Member
Join Date: Jul 2007
Posts: 5
| mpg
just completed a 900 mile trip towing a 24' dovetail equipment trailer with about 1200#...GVW of about 12K#. towed the trailer 800 of those 900 miles...11.9 mpg | |
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