Premium Unleaded is a type of gasoline that has a higher octane rating, typically 91 or 93, compared to regular unleaded fuel. This higher octane level helps prevent engine knocking, which can occur in high-performance vehicles or engines with higher compression ratios. Many car manufacturers recommend using Premium Unleaded for specific models to ensure optimal performance and efficiency. While it often costs more than regular gasoline, some drivers choose it to enhance their vehicle's power and fuel economy, especially in sports cars or luxury vehicles designed for premium fuel.