Starbrite Star Tron Gasoline Additive - Stabilize the fuel in your gas tank or gas can by helping to prevent the phase separation that happens when gasoline can sit for to long. By adding this gas additive by Starbrite into your gas you improve the octane level of your old or even substandard fuel which keeps your engine running smoother and cleaner. 1oz will clean about 16 gallons of gasoline. Unique enzyme formula Improves performance of all engines Improves combustion efficiency Improves fuel economy Reduces emissions Cleans entire fuel delivery system Removes carbon deposits Ideal for E10 / E15 / E20+ ethanol-blended gasoline Stabilizes gasoline for up to 2 years