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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 11-20-2012, 06:37 PM   #1 (permalink)
Glow Plug
Join Date: Nov 2008
Location: KC/Liberty
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tires and mileage

I need to move quick on new tires. How much mileage difference do you think I will see if I go with 265 instead of 245?

2006 GMC Sierra 2500HD LBZ
4x4 Cew Cab Short Bed SLE
Hypertech Max Energy
Alligator Performance Trans Cooler Lines
Factory air box mod
Dirty Hooker power steering lines
Airdog Raptor lift pump 100 GPH
B&W Turnover Ball

2005 GMC Sierra SLT 2500HD LLY
Hypertech Max Energy
EGR Blocker
Firestone Ride Rite Air Bags
B&W Turnover Ball

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Old 11-20-2012, 06:55 PM   #2 (permalink)
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Location: Windsor, Ontario
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I get between 20 and 22mpg with my 265's if i dont hammer it

2004.5 GMC 2500HD lly CC/SB SLE Silver 4x4 ||Efilive V2/DSP5 tuned by Rob Coddens at ATP, Billet Danville 4094, Exergys, Merchant Built Trans, FASS 150, CAT fuel filter, MA fh rebuild kit and billet bleeder screw, MA tie rd sleeves, Cognito braces, 5" turbo back strightpipe, LML drivers side manifold, PPE EGT, Boost, Rail pressure Guages, egr blocked, pcv rerouted, K&N intake, Afe mouthpiece, resonator capped, auto headlight mod/all on mod, 6000k HIDs lows and fogs, roll up tonneau cover, weathertech mats||
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Old 11-20-2012, 07:05 PM   #3 (permalink)
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Location: Apopka Florida
Posts: 3,310
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I lost about a mile per gallon.
2006 2500HD CCSB 4X4 RED LBZ
Spray-In Bed Liner, Air Bags
Custom Reese 20K slider FWH/Gooseneck hitch
265/75/16 Michelin LTX AT2's on PYO's tow tune, PPE Dual Fueler (P0087 cure)
Kitty on a "warm shelf", K+N Drop-in filter
Amsoil in all places, Amsoil BMK-27 Bypass
KYB shocks (stock sucked)
Autometer Boost/Pyro gauges/Edge CTS
EGR blocker and (Kennedy) finger stick
Transgo Jr. installed at 77325 miles
Kennedy Pump Rub plate installed, 98060 miles
Kennedy lift pump, reserve tank with transfer pump
2011 LML torque converter.
14.558 @ 91.03 Hypertech now?????
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