A fuel conditioning and combustion chamber feeding system for an internal combustion engine, comprising: a fuel conditioning vessel, at least one liquid fuel dispersing nozzle mounted for discharging liquid fuel into said fuel conditioning vessel, and at least one gas inlet port for feeding gas into said fuel conditioning vessel; an electronically controlled gas pressure regulator configured to maintain a gas pressure P 2, a gas source, a gas line fluidically connecting an outlet port of said gas source with an inlet port of said gas pressure regulator, and a gas line fluidically connecting said gas pressure regulator with said at least one gas inlet port in said fuel conditioning vessel; an electronically controlled low-pressure fuel pump fluidically connected between a fuel source and said at least one fuel dispersing nozzle, said low-pressure fuel pump maintaining a fuel pressure P 1 higher than said gas pressure P 2; and wherein the gas fed into said fuel conditioning vessel is dissolved in the liquid fuel pumped into said fuel conditioning vessel for forming a liquid/gas fuel solution; a high-pressure fuel pump for raising pressure to a high level P 3 exceeding a pressure P 4 present in the combustion chamber of internal combustion engine at the moment of injection and a liquid/gas fuel solution supply line fluidically connecting an outlet port of said fuel conditioning vessel to an inlet port of said high-pressure fuel pump; a fuel supply system for feeding conditioned fuel in the form of the liquid/gas fuel solution from said high pressure fuel pump to electronically controlled fuel injectors for injection at a pressure P 3 exceeding a pressure P 4 present in a combustion chamber of the internal combustion engine at a moment of injection; and an electronic control system connected to said gas pressure regulator, to said low-pressure fuel pump, and to said electronically-controlled fuel injectors for providing timing and duration optimization for operating the electronically controlled devices for maximum fuel efficiency. a fuel conditioning vessel, at least one liquid fuel dispersing nozzle mounted for discharging liquid fuel into said fuel conditioning vessel, and at least one gas inlet port for feeding gas into said fuel conditioning vessel; an electronically controlled gas pressure regulator configured to maintain a gas pressure P 2, a gas source, a gas line fluidically connecting an outlet port of said gas source with an inlet port of said gas pressure regulator, and a gas line fluidically connecting said gas pressure regulator with said at least one gas inlet port in said fuel conditioning vessel; an electronically controlled low-pressure fuel pump fluidically connected between a fuel source and said at least one fuel dispersing nozzle, said low-pressure fuel pump maintaining a fuel pressure P 1 higher than said gas pressure P 2; and wherein the gas fed into said fuel conditioning vessel is dissolved in the liquid fuel pumped into said fuel conditioning vessel for forming a liquid/gas fuel solution; a high-pressure fuel pump for raising pressure to a high level P 3 exceeding a pressure P 4 present in the combustion chamber of internal combustion engine at the moment of injection and a liquid/gas fuel solution supply line fluidically connecting an outlet port of said fuel conditioning vessel to an inlet port of said high-pressure fuel pump; a fuel supply system for feeding conditioned fuel in the form of the liquid/gas fuel solution from said high pressure fuel pump to electronically controlled fuel injectors for injection at a pressure P 3 exceeding a pressure P 4 present in a combustion chamber of the internal combustion engine at a moment of injection; and an electronic control system connected to said gas pressure regulator, to said low-pressure fuel pump, and to said electronically-controlled fuel injectors for providing timing and duration optimization for operating the electronically controlled devices for maximum fuel efficiency.