fish58
florida
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Joined: 07/07/2006
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My 2004 Chevy Silverado 3500 gets only 12 mpg without towing and i drive like a nun.After doing some reading it turns out, it appears the the turbo inlet tube is restricted due to a necessary bend from the manufac. AFE makes an after market tube that supposedly allows 73% more airflow. Has anyone ever replaced this tube and were you successful in bumping up your mpg? Also, if anyone has added a chip to my model & year, what brand and how much improvement did it make? Any other suggestions to increase my mpg, I would love to hear some recommendations.
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donn0128
Pronounced Ore-gun
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Joined: 04/21/2005
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When I had a LLY I saw close to 20 non towing. I suspect you have injector issues. Fix that and your milage should go up a lot.
Donn,Lorri,Max (The Rescued Lab)
Resident Know It All 
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bartlettj
Forest Grove, OR
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More airflow doesn't usually increase MPG, in fact it often hurts it because it allows the engine to make more power. It sounds like you probably do need a fuel injector repair.
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bob213
Fresno, CA
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I replaced mine. Not for mileage but for turbo and engine cooling. Really did not see an increase in fuel mileage. Mine was an 05'. I agree that you may have other issues.
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JKrussow
Alabama
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I have the AFE turbo mouthpiece and a Bank IQ system. The mouthpiece improved mileage a little but if you are expecting to go from 12 mpg to say 20 mpg it's not going to happen. I got the mouthpiece as part of my plan to lower incoming air temps to prevent overheating. If you have been seeing the 12 mpg for quite a while (1000s of miles) then it may be the truck. But if the mileage has just started to suffer I would look into Donn's suggestion and have the injectors tested.
I get 11 to 13 mpg towing and 15 to 17 empty. Banks system is set for economy when empty and to power level 4 when towing. Either way I do try and set speed records with; I'm driving no faster than 60 mph towing and 65 empty.
John & Rana
Toby "da bear" RIP 12/28/12
Bandit, Kato & Punkin
2004 GMC Sierra 3500 D/A DRW CC, Banks IQ w/Econominder, Speedbrake & CAI, Curt Q5 20K
2011 Heartland Big Country 3650RL
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the bear II
Torrance CA.
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Joined: 02/14/2008
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You may find some help at www.dieselplace.com
Look for the forum aimed at duramax engines or Chevy light trucks.
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ScottG
Bothell Wa.
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Joined: 02/25/2005
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I'm curious, do you have to crank the starter longer now than you used to? That's one of the early signs of injector problems.
Scott, Grace and Wesly
2003 Dodge 3500 4x4, 6 speed Cummins (lightly bombed),
2004 Forest River 25RKS many, many mods.
H0NDA eu2000i
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Turtle n Peeps
California
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Joined: 06/23/2008
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donn0128 wrote:When I had a LLY I saw close to 20 non towing. I suspect you have injector issues. Fix that and your milage should go up a lot.
^^^ This.
~ Too many freaks & not enough circuses ~
"Life is not tried ~ it is merely survived ~ if you're standing
outside the fire"
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NewsW
US
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Joined: 02/06/2012
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Need more specifics, mileage, maintenance, etc.
If it is a DRW, 12mpg may not be that unusual.
Winter fuel and cold weather use also gets a lot less mileage.
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M GO BLUE
Southgate, MI
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Joined: 01/29/2001
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My 2005 I still get 18-19 non-towing....
2005 Chevy Silverado 3500 dually CC/LB Duramax/Allison
2008 Jayco Designer 35RLTS fifth wheel
Onan 5500W Marquis Gold gas generator (HGJAB - 1038D)
MICHIGAN RALLY - July 19-21, 2013 Click here
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