NOVELTY - A system for regulating the operation of an engine comprises: product gas generator for producing a product gas comprising a substantially stoichiometric mix of hydrogen and oxygen; and product gas injector for dynamically adding the product gas to the combustion air in a substantially predetermined ratio with hydrocarbon fuel, from the source of hydrocarbon fuel, presently consumed by the engine.    USE - The system and method are useful for regulating the operation of an engine (claimed).    ADVANTAGE - The system provides product gas volumetric requirement information; and takes into account the engine style, primary torque requests, and hydrocarbon fuel consumption information to develop an operating system specific application that produces consistent measurable results. Likewise, the system promotes a higher degree of oxidative completion, and extracts more energy from the fuel and reduces the level of unburned hydrocarbons in the combustion exhaust.    DETAILED DESCRIPTION - A system for regulating the operation of an engine, which receives hydrocarbon fuel from a source of hydrocarbon fuel and combustion air from a source of combustion air, where a mixture of the hydrocarbon fuel and combustion air is combusted in the engine to release at least one of mechanical energy and thermal energy as well as combustion by-products, the system for regulating the operation of an engine comprises: product gas generator for producing a product gas comprising a substantially stoichiometric mix of hydrogen and oxygen; and product gas injector for dynamically adding the product gas to the combustion air in a substantially predetermined ratio with hydrocarbon fuel, from the source of hydrocarbon fuel, presently consumed by the engine. An INDEPENDENT CLAIM is a method for regulating the operation of an engine, which receives hydrocarbon fuel from a source of hydrocarbon fuel and combustion air from a source of combustion air, where a mixture of the hydrocarbon fuel and combustion air is combusted in the engine to release at least one of mechanical energy and thermal energy as well as combustion by-products, the method for regulating the operation of an engine comprises: producing a product gas comprising a substantially stoichiometric mix of hydrogen and oxygen; and dynamically adding the product gas to the combustion air in a substantially predetermined ratio with hydrocarbon fuel, from the source of hydrocarbon fuel, presently consumed by the engine.