PURPOSE: To perform optimal control continuously irrespective of individual difference of engine characteristic or elapsed time, by providing means for measuring and storing actual fuel consumption for various operating variables of engine or various travel variables of car.

CONSTITUTION: An operating unit 1 will receive signals (S1WS8) indicating various operating variables of engine and various travel variables of car to perform operation in accordance to a program prestored in ROM thus to control solenoid valves 10, 11, relay 17, fuel injection valve 18, ignition coil 2, etc. While a fuel flow signal S12 and an engine torque signal S13 are fed to said unit 1. Consequently fuel consumption can be reduced irrespective of individual difference of characteristic or aging.