I've been running 92 octane in my car for the last 5 years or so. There is one local station that has 91 ethanol free fuel. Should I consider running that instead? Assuming I can keep my tune the same? Thank you!
I wouldn't. It's still lower octane. You won't see any gains for the extra money.
I still do use the non ethanol fuel for when I store the car for the winter tough, no ethanol to absorb moisture.