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12.1 is the very best I've gotten and that's after the latest tune from Livernois. I track my mileage very carefully and do not rely on the cars display for my final numbers. I asked them about gas mileage and was told I should be getting what others are getting. Not sure how to interpret that but with a rough, surging idle and 3-4mpg less than most others I've read about with similar mods, I am sure there is room for improvement in this tune. Kinda stuck tho since the folks that tune are 3hrs away and have done all they can it seems.
Really sucks for a 2010 2SS with only 19k miles... Mods listed below.
TDOD/AFM Delete kit and stage 2C camshaft.
Cam specs are: 224/236 .620/.620 117 LSA
CNC valve job the heads and port the intake and throttle body
Livernois Motorsports Dual Valve Spring Package (Livernois Motorsports Dual Valve Springs, Titanium Retainers, Valve Spring Locators, Locks, & Valve Seals)
ARP Head Bolts
MLS Head Gaskets
Hardened Pushrods
GMPP LS7 Lifters
GMPP LS2 Lifter guide kit
GMPP LS2 Valley Cover
GMPP Valve Cover Breather Block-Off
GMPP LS7 Camshaft Sprocket
GMPP Timing Chain Dampner
GMPP PCV Hose for Non-DOD applications
GMPP LS2 Lifter guide kit
GMPP Exhaust Gaskets
GMPP Timing Cover w/ Sensor
ARP Timing Chain Bolts*
Kooks Long Tube Headers and high flow mid pipes
PI 2400 Single Disc Converter
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