In Europe, Australia, and New Zealand, 98 octane (RON) is widely available at major service stations as "Premium Unleaded."
These fuels are designed for sports cars that require high resistance to "knocking".
Most standard vehicles, like a Toyota Prius or Honda CR-V, are optimized for 87 octane and will not see a performance benefit from 98 octane. SS 100 - 100 Octane Unleaded Gas - Sunoco Race Fuels
Companies like Petroleum Service Company sell 5-gallon pails or 54-gallon drums of 98-octane unleaded, ethanol-free fuel for delivery. 3. Quick Comparison Rating System Common Premium Grade Europe/Australia RON USA/Canada AKI (R+M)/2 Should You Buy It?
Recently introduced 98-octane specifically for sports and high-performance vehicles. 2. North America (AKI)
If you truly need 98+ AKI for a high-performance or tuned engine, you often have to look for "Race Gas" at specific retailers.