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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 02-09-2015, 12:46 PM   #11 (permalink)
Diesel Boss
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Join Date: Jul 2005
Location: Phoenix, Arizona
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I run about 65 psi up front and 62 psi in rear right now, 75 psi when I tow heavy. I would run a 55/53 psi in my 2005 cause it gave a better ride and I never had the TPMS warnings to worry about. The 2015 and the Cognito lift I have rides better, so I don't notice the higher pressure and it's probably better for mileage and tread wear.

2015 Chevrolet 2500 HD LTZ Duramax, CCSB, 4x4 - Cognito Stage II 6" lift, RBP Fury wheels and 295/65/20 Toyo MTs, DuramaxTuner SPADE, Air Dog II 4G lift pump, Firestone Air Bags/Air Lift Air Compressor, GM Assist Steps, MBRP exhaust tip, Passport 9500iX Radar Detector

SOLD 2005 Chevrolet 2500 HD Duramax, CCSB, 4x4

2017 Can Am Maverick Maxx, 2009 Tahoe 215Xi Deckboat, 2007 Weekend Warrior FSC2800 Toyhauler, 2008 Ducati Hypermotard
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Old 02-17-2015, 07:51 PM   #12 (permalink)
Diesel Pro
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LOL I'm deleted obviously and not an LML but an LMM which is a lighter vehicle to begin with and I get about 11MPG in town which is most of my driving. Not lifted just 33's.

2016 Sierra 3500HD Denali CCSB SRW
UDP Tunes on V2/SOTF Switch/Danville 63.5 Billet-S480FMW Billet Twins by WCFab(Illusion Blue)/Exergy 100% Injectors/Exergy 12MM CP3/Banks Intercooler/HSP Billet Manifolds/PPE Up Pipes/PPE Oil Pan/PPE Deep Trans Pan/AirDog 165 II-4G/FloPro 5" SS Turbo Back/MBRP 6" SS Tip/CTS2 Insight/EDGE EGT Probe/EDGE 0-100 Boost Sensor/Cognito 4-6/Cognito Front Driveline/Cognito Swaybar/Cognito PISK/PPE Tie Rods/King 2.5 Resis/Air Lift 5000 Ultimate Bags/Air Lift Wireless One Compressor/Wilwood TX6R Brakes Front and Back/LT325/60R20 BFG KO2s/20x9 Method 309s/AMP Steps/Yukon 4.11s/Royalty Core RC1/Retrax Powertrax Pro MX/Titan STAFS 30 Gallon/JL C5s/JL 12TW3-D4/JL VX600/6i/JL XD300/1V2
Mike L Trans (Goerend R/Alto G3s/RatioTek)

SOLD2015.5 GMC Sierra 3500HD Denali CCSB
SOLD2007.5 GMC Sierra 2500HD SLT CCSB SDP Twins/Mike L Trans/ATP Tunes

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Old 02-19-2015, 02:08 AM   #13 (permalink)
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A pound of rotating mass is equal to 5# in the bed. So the 300# more is more like 1500#. The effect is greater the more starting and stopping you do.

I get 15 on 265's, I think I got better mileage before mods but when I had a lift and 35" toyo MT
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Old 03-01-2019, 11:14 PM   #14 (permalink)
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2011 lml I average 13-16 50/50 undeleted now im getting 18-24 50/50 deleted it also depends on how hard acceleration i give it
'99 GMC 6.5td stock
'11 chevy silverado 2500 hd 6.6 duramax
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