A method for treating the air-fuel mixture to feed to any one internal combustion engine, characterized by the following magnetization steps: a) magnetization and treatment of the fuel present inside any one tank due to at least one immersion container, equipped with a plurality of holes placed in proximity to the fuel duct and containing at least one cylindrical container, equipped with a plurality of holes, in turn adapted to contain a plurality of magnetic elements spaced from each other by the same number of ceramic spacers; b) transfer of the treated fuel of the tank, by means of the fuel duct, into a passage container containing a sequence of curves made by the aforesaid fuel duct, said duct being equipped with at least one pair of magnets adapted to polarize the fuel with an electric charge with the same sign as that which will be produced by the magnetization following the subsequent passages of the fuel in the system; c) introduction of the fuel treated in devices a and b, via the duct, into at least one fuel filter in turn magnetized due to at least one pair of magnets placed directly on said fuel filter and capable of creating a charge with sign analogous to that of steps a and b; d) exit of the fuel duct from the fuel filter and further magnetization of the fuel present in the fuel duct due to at least one pair of magnets placed directly in contact with said fuel duct and situated in proximity to the system for injecting said fuel into the combustion chamber, having sign analogous to that induced in devices b, c; e) magnetization of the water and/or of the liquid for cooling the engine due to at least one pair of magnets placed directly on the tube of the cooling water and capable of creating a charge with sign analogous to that induced in devices b, c, d; f) magnetization of the air fed to the internal combustion engine due to at least one pair of magnets, placed on the suction duct in proximity to the engine and adapted to provide the air fed to the engine with a charge with sign opposite that provided to the fuel fed to the engine by means of devices b, c, d; g) mixing in the combustion chamber of any one internal combustion engine, of the fuel as treated in devices a, b, c, d with the air charged with opposite sign according to device f. a) magnetization and treatment of the fuel present inside any one tank due to at least one immersion container, equipped with a plurality of holes placed in proximity to the fuel duct and containing at least one cylindrical container, equipped with a plurality of holes, in turn adapted to contain a plurality of magnetic elements spaced from each other by the same number of ceramic spacers; b) transfer of the treated fuel of the tank, by means of the fuel duct, into a passage container containing a sequence of curves made by the aforesaid fuel duct, said duct being equipped with at least one pair of magnets adapted to polarize the fuel with an electric charge with the same sign as that which will be produced by the magnetization following the subsequent passages of the fuel in the system; c) introduction of the fuel treated in devices a and b, via the duct, into at least one fuel filter in turn magnetized due to at least one pair of magnets placed directly on said fuel filter and capable of creating a charge with sign analogous to that of steps a and b; d) exit of the fuel duct from the fuel filter and further magnetization of the fuel present in the fuel duct due to at least one pair of magnets placed directly in contact with said fuel duct and situated in proximity to the system for injecting said fuel into the combustion chamber, having sign analogous to that induced in devices b, c; e) magnetization of the water and/or of the liquid for cooling the engine due to at least one pair of magnets placed directly on the tube of the cooling water and capable of creating a charge with sign analogous to that induced in devices b, c, d; f) magnetization of the air fed to the internal combustion engine due to at least one pair of magnets, placed on the suction duct in proximity to the engine and adapted to provide the air fed to the engine with a charge with sign opposite that provided to the fuel fed to the engine by means of devices b, c, d; g) mixing in the combustion chamber of any one internal combustion engine, of the fuel as treated in devices a, b, c, d with the air charged with opposite sign according to device f.