PRI-G 1 Gallon size product for gasoline PRI improves ignition quality of your fuel by improving combustion efficiency PRI-G Provides better fuel ecomony - 5 to 13% 128 ounce botttle. Treats up to 2040 gallons of gasoline. (1 oz. to 16 gallons) PRI-G is a fuel stabilizer that preserves stored fuels in refinery fresh condition for years.