87 for me. Some Rx-7 owners even add additaves that lower octane. The Rotary burns fuel so quickly, it likes the lower octane so the gases will start expanding faster. IT runs WORSE on premium. Hwever too low is dangerous, and boosted /Rx-8 high compression applications should use premium. Random rotary octane fuel fact.

Some N/A Rx-7 race cars use a fuel with an octane of about 80.