Point-of-sale octane/cetane-on-demand systems for automotive engines

A method of dispensing fuel at a point-of-sale, the method comprising:

• providing a point-of-sale fuel dispensing system comprising:
• a storage tank;
• a pump assembly comprising:
• a customer interface for both retail payment and fuel grade selection for the vehicle;
• a separation unit that receives at least a portion of a market fuel and converts it into an octane-rich fuel component and a cetane-rich fuel component;
• a first enriched fuel product tank that receives the octane-rich fuel component;
• a second enriched fuel product tank that receives the cetane-rich fuel component;
• and
• a controller to direct the flow of at least one of the market fuel, the octane-rich fuel component and the cetane-rich fuel component through the pump assembly based on user input at the customer interface;
• converting at least a portion of the market fuel that is stored in the storage tank that is situated at the point-of-sale into the octane-rich fuel component and the cetane-rich fuel component;
• and
• conveying at least one of the market fuel, the octane-rich fuel component and the cetane-rich fuel component to a vehicle through the pump assembly.