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^^ he's correct. This car requires 91+ octane through compression alone. Timing is another thing they tweak to require higher or lower octane ratings (thus boosting power) But you can't really tweak this as much at 11:1. But there are 10:1 and stuff inbetween 10:1 and 11:1 that requires 91+ octane because the timing is advanced pretty far from the factory.
Don't put 87 octane in your car ever. If you have to, drive it like a baby, and don't put a full tank ever. Fill it up with small amounts like 1-2 gallons.
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