5.9L 12V Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps Related to Performance and Longevity

I want the best fuel mileage

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Old May 1, 2007 | 08:27 PM
  #1  
Carl's Avatar
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From: Lansing, MI
Default I want the best fuel mileage

So in a few weeks I'll be going down to Lima, Ohio, for the 4x4 Jamboree. May 18-20th. It's about 3 hours away.
Since I can only make it for friday, I won't be entering my truck. I am interested though, in getting the best mileage I can down there and back, ya know, to brag about, LOL.

Aside from what's in my sig, I should also note I have 38" trxus STS tires, K&N cold air intake, Banks #8 fuel plate, and a 4" down pipe.
So what all can I do to get the very best milage possible for the trip?

What about the AFC position? starwheel? plate position? timing? Best RPM to target?
Thanks for any help
 

Last edited by Carl; May 1, 2007 at 08:29 PM.
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Old May 1, 2007 | 08:36 PM
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put every thing back to stock

change all fluids, engine, differentials, trans, transfer, split fire spark plugs make sure proper tire pressure, fuel filter.

probably keep rpms under 3,000
 
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Old May 1, 2007 | 08:48 PM
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Originally Posted by bow2no1
put every thing back to stock

change all fluids, engine, differentials, trans, transfer, split fire spark plugs make sure proper tire pressure, fuel filter.

probably keep rpms under 3,000
I really hope you skip the Split Fire Spark Plugs. I hope that was a joke Bow2, If not your scarin me again.
 
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Old May 1, 2007 | 08:50 PM
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Advanced the timing on my 94 to 14 and it seemed to improve it a little, although I was at 10 to begin with.
 
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Old May 1, 2007 | 08:55 PM
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Originally Posted by 99 cummins
I really hope you skip the Split Fire Spark Plugs. I hope that was a joke Bow2, If not your scarin me again.
tried to sneak that one in the middle just wanted to see if any one would notice.. i can't fool you
 
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Old May 1, 2007 | 09:00 PM
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Thought we were gonna have to go back to the basics, like birds and the bee's stuff there for a minute.
 
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Old May 2, 2007 | 12:12 AM
  #7  
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Yeah, Dennis, I agree with you, those Split Fire plugs are crap!
 
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Old May 2, 2007 | 04:32 PM
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Ok so I'm thinkin I'll slide the fuel plate, and AFC housing back, tighten up the starwheel, flush the diffs, and transfercase, change the oil, advance the timing, drive like theres an egg under the pedal, and keep it around 60-65MPH. I'm wondering how I know how far to advance the timing, before it starts to hurt fuel economy? Thanks for the responses
 
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Old May 2, 2007 | 04:43 PM
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Maj Easy's Avatar
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convert your truck to a low rider....
make sure you have a good air dam.....

keep the rpm's at or below 1750.....

guaranteed best mpg's with this mod.
http://www.gearvendors.com/ffacts.html
expect 24% saved in fuel efficiency,

only cost 3.5 to 4.K
 

Last edited by Maj Easy; May 2, 2007 at 05:23 PM.
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Old May 2, 2007 | 05:15 PM
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i agree with maj keep the rpms low.

also if you have any narrow tires to swap out. that would help
like a 235X85
 
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