PURPOSE: To facilitate desired mixing for mixed fuels by automatically dispensing one or more automotive fuel additives based on the prescribed mixing ratio when refueling by incorporating an automotive fuel additive dispensing and blending system in a fuel distributor at a service station.

CONSTITUTION: The fuel distribution computer 2 and a service station fuel distribution unit 1 concurrent with display panel 3 make the fuel distribution computer 2 calculate the cost and quantity of the additive to be mixed in the fuel and at the same actuate flow one of fuel storage tanks 28-30. The system comprises additive storage tank 25, and, after being controlled by controller 4 and through distribution system 27, each additive is free to be poured in the upper stream of each fuel systems 32-34 of each grade to be mixed. Controller 4 indicates the fuel grade and the flow rate and possesses the method to preset mixing ratio of each additive.