64 ounce (1/2 gallon) bottle of Stanadyne Diesel Fuel Additive Performance Formula will treat 250 gallons of fuel. This bottle has measurement markings to treat 60 gallons of fuel at a time. Stanadyne's brand boasts the following: more power and performance, improved cetane, and lubrication. It also cleans and protects your engine, while providing cold weather protection. It is compatible with ULSD and B20 and it can increase overall fuel economy. Stanadyne meets all diesel system requirements.