Premium unleaded is a type of gasoline that has a higher octane rating, typically 91 or 93, compared to regular unleaded fuel, which usually has an octane rating of 87. The higher octane helps prevent engine knocking, allowing high-performance vehicles, such as sports cars and luxury vehicles, to run more efficiently and smoothly. Many car manufacturers recommend using premium unleaded for specific models to optimize performance and fuel efficiency. While it generally costs more than regular unleaded, some drivers choose it to enhance their vehicle's power and longevity, especially in high-compression engines.