Does 2004 Mazda rx8 have to use 91 octane?

The 2004 Mazda RX-8 is designed to run on 91 octane fuel for optimal performance and efficiency. While it may be able to operate on lower octane fuels, using them can lead to reduced power, potential engine knocking, and decreased overall performance. To ensure the longevity and reliability of the rotary engine, it's best to adhere to the manufacturer's recommendation of using premium fuel.