5.9 Cummins fuel mileage - Chevy and GMC Duramax Diesel Forum

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post #1 of 25 (permalink) Old 04-09-2012, 11:07 AM Thread Starter
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5.9 Cummins fuel mileage

So a guy at work just got a 07 5.9 mega cab 4x4. Sitting on 35" with a 4" lift, has a 4" exhaut and no programmer. He just filled her up 524 miles and 30 gallons of fuel. That works out to 17.4 mpg. He said he did about 80 miles of towing with that fill up too. A few other people I know with the 5.9 all claim 20+ mpg. My question is how or why is the cummings more fuel efficient? You can look in my sig, I get 16 mpg around town.

2006 LBZ, White LT, CC/SB, 4x4, 6.6L, Auto,
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Last edited by buttapollock1010; 04-09-2012 at 11:10 AM.
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post #2 of 25 (permalink) Old 04-09-2012, 11:09 AM
it stinks and whistles :)
 
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Being a straight six 5.9 might have something to do with it


Sent from a muddy shoe phone

06 lly,
Efi From ATP trucks,
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rare parts gen2, bilstein 5100s, all season brace,
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http://performancetruckproducts.com/
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post #3 of 25 (permalink) Old 04-09-2012, 11:29 AM
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It's a Cummins

2002 GMC 2500HD 5 Inch Diamond Eye Exhaust, PPE Boost Valve, EFI Live from Idaho Rob
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post #4 of 25 (permalink) Old 04-09-2012, 11:53 AM
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that is one thing i have never understood???

If black smoke= broke

Then wtf?? Why do 5.9s get well over 20. Run fast as shit in the 1/4 and poor it out.

If smoke means its unburnt fuel then how do they get 20+ mpg and still roll coal?

2015.5 Chevy 3500HD LTZ Z71 CCSB SRW. Summit White
BDS 4.5 w/FOX-Fuel Maverick 20x10s
Toyo R/T 35x12.50
PPEI Tuned, 5" exhaust, Airdog 4G, PPEI intake, EDGE CTS

SOLD 03 2500 built trans/efi/leveled
1972 Nova Built 350 w/ 700r4
1966 Mustang 5.0 efi T-5 scca track car
1984 K10 400hp sbc on 40s
1999 gmc 2500 - daily
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post #5 of 25 (permalink) Old 04-09-2012, 12:00 PM
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2005 ext cab sb LLY
4" exhaust w/muffler, EGR delete/Sinister diesel, Kodiak LBZ mouthpiece, PCV rerouted, Nicktane/CAT adapter, Autometer pyro & boost gauges, EFI Live by Kory, Transgo, pump rub kit, LBZ intake conv, H2's, Debadged
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post #6 of 25 (permalink) Old 04-09-2012, 12:05 PM
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did you personally witness the odometer and the fuel pump???? lawl

-Lee-
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post #7 of 25 (permalink) Old 04-09-2012, 12:06 PM
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My step dad had a 1995, 1999, 2001, and a 2003 and after they passed 145k miles, they all got 21-25 mpg. Completely stock, not even an exhaust. The only thing I can think of is the fact that they are 6 cylinder and have peak torque around 1400-1500 rpms.

Zach

Current: 2011 Silverado LTZ CC/SB 4x4, Deleted, FASS, Full Exhaust, S&B, Kory Tuna, Dropped, 35" Toyo M/T

Past: 2007 Sierra Classic 4x4, Dropped, built trans, stock motor, stock air, stock fuel, EFI, 556/1102, 12.63@105... SOLD
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post #8 of 25 (permalink) Old 04-09-2012, 12:18 PM
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Quote:
Originally Posted by lddrew View Post
did you personally witness the odometer and the fuel pump???? lawl
My brother in law has a 2004 woth a smarty and no muffler.

Lifted on 37s.

I personally drove this truck form Co to texas and Averaged 19.5 the whole way.

DOING 75mph!!!

Thats hand calc. I could get well over 500 miles to a tank

2015.5 Chevy 3500HD LTZ Z71 CCSB SRW. Summit White
BDS 4.5 w/FOX-Fuel Maverick 20x10s
Toyo R/T 35x12.50
PPEI Tuned, 5" exhaust, Airdog 4G, PPEI intake, EDGE CTS

SOLD 03 2500 built trans/efi/leveled
1972 Nova Built 350 w/ 700r4
1966 Mustang 5.0 efi T-5 scca track car
1984 K10 400hp sbc on 40s
1999 gmc 2500 - daily
2010 Caddi CTS - ol ladies ride
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post #9 of 25 (permalink) Old 04-09-2012, 12:43 PM
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lower displacement, torque curve way early and driving like a grandma?

2007 CCSB LBZ
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post #10 of 25 (permalink) Old 04-09-2012, 12:46 PM Thread Starter
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No I did not watch him! But he is a stand up guy. No reason to bs me.

2006 LBZ, White LT, CC/SB, 4x4, 6.6L, Auto,
EFI Live (Kory Willis)
EGR blocked/PCV rerouted
Nicktane adaptor CAT 1R-0750 & Fumoto drain valve
AD 2 165 with CAT 1R-0751
WeatherTech, Rino-lined, Russel SS brake lines
5'' SS DE w/muff
Curt 18K 15602
Michelin LTX AT/2 265/75/16e
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