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Maybe I'm just being paranoid, I'm sure 91 is fine even though it wouldn't make peak power. It just makes no sense that Acura would make the factory base tune for 93 which isn't widely available across NA. Apparently California doesn't have higher than 91 octane? It would have made more sense...

Have you guys been filling up your DE5s with 91 or 93? I saw that Acura recommends 93 for the ITS but Honda recommends 91 for the CTR. For those of you using 91... any knocking? I'm pretty sure the 93 recommendation is purely for peak power and Acura wouldn't be stupid enough to have an ECU...