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It is only beneficial when the motor and combo can make more power through additional timing in excess of what's capable with 91 octane.
In response to the fuel adjustment, I usually do the global adjustment across the board.
Sent with a shot of DROID go fast
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Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods.
Tuned by me with SCT Advantage
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