NBs call for 91 according to the owners manual... Assume it is for more timing advance.
RA1s <<<<<< Victoracer v700s....(personal experience from the Stealth on 275/40-17s) Don't know where they land vs. ST, but probably not much better. They just don't heat up and get sticky like they do at the track.
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I am a Commodore PET --- Now get off my lawn you kids...
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