One four ounce bottle treats 10-20 gallons of gasoline, 30-55 gallons of methanol, or 5-10 gallons of diesel. The product is widely used from lawnmowers to top fuel dragsters. Fuel fragrances are intended to set you apart from the rest and be a crowd pleaser. They do not enhance or inhibit performance and are safe to use in all internal combustion engines. For best results use in vehicles without catalytic converters.