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Flex fuel sensor reads the percent of ethanol in the fuel mixture and adjusts the tune accordingly...so you can run whatever blend that you like or is available at the pump. It should be standard on every vehicle GM sends out the door imo.
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2016 NFG 1SS A8
Options-2SS Leather/NPP
Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP
Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA
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