Increases octane up to 4 numbers for improved performance Maximizes power Reduces engine knock Improves ignition & responsiveness Helps fuel burn more cleanly Removes carbon deposits For off-road and racing use only. Increases octane up to four numbers. Helps reduce engine knock for maximum power, responsiveness and performance.INCREASES OCTANE UP TO 4 NUMBERS Significantly increases engine response and power in two- and four-stroke gasoline-fueled engines. Just one treatment reduces engine knock, improves ignition and helps fuel burn cleaner. Most users find one 12-ounce (354 mL) bottle for 15 gallons (57 litres) of gasoline provides the ideal performance increase. EXCELLENT LEAD SUBSTITUTE Excellent as a lead substitute in collector automobiles, older off-road equipment and pleasure vehicles.