Power Plus fuel fragrances are designed to eliminate unpleasant exhaust fumes, and the eye, nose, and throat irritation that come with them. Just mix them in with your regular fuel. Safe for all internal combustion engines, they will not inhibit or enhance engine performance. One 4 oz. bottle treats 20 gallons of gasoline or nitro methane, 55 gallons of alcohol/methanol, or 10 gallons of diesel fuel.