Liquid Performance Ethanol Equalizer is all you need to fix problems related to ethanol added fuels. Its synthetic blend prevents water build up, fuel system corrosion and ethanol phase separation that robs fuel of octane. Ethanol Equalizer replaces lost octane, increases horsepower, and stabilizes fuel for extended storage. One 4oz. bottle treats up to 40 gallons. This product is EPA registered. Available in 1oz. and 4oz. Bottle.