-Storage use/ out of season: Treat fuel if will sit more than 60 days in the unit’s fuel tank. Treatment rate is 1 oz. to 1 gallon of gasoline.-Yamalube Fuel Med RX was designed for use with ethanol-enriched gasoline. No other formula on the market provides this level of ethanol fuel corrosion protection for metals and aluminum fuel system components.-More ethanol means more sulfate salts, which results in more corrosion. Yamalube’s special formulation not only stabilizes all types of gasoline, but provides superior metal corrosion protection from the high levels of ethanol sulfate salts found in today’s fuel. It also provides advanced metal protection for future E15 and/or E20 fuel.-Alcohol-free formula that not only locks in fuel potency, but helps to prevent fuel oxidation, phase separation, gum, and varnish build up. Even fights corrosion in harsh saltwater environments.-Continuous use/ in-season: Good practice is to treat the unused fuel no later than 7 days after purchase; best practice is to treat fuel at time of purchase. Treatment rate is 1 oz. to every 3 gallons of gasoline.-The handy 3.2 oz size is formulated to treat 5 gallons of gas for continuous in-season use.