providing a hydrogen generator,

providing a compression engine

assessing requirements for hydrogen assisted combustion within the compression engine,

causing a reaction of materials in the hydrogen generator in the presence of heat to produce a hydrogen containing gas blend or gas mixture comprising by volume 50% or less hydrogen gas and at least one other gaseous by-product of the reaction, including selecting for the gas blend or gas mixture relative amounts of the hydrogen gas and the at least one other gaseous by-product in accordance with the nature of the at least one other gaseous by-product and the requirements for hydrogen assisted combustion within the compression engine,

reducing the temperature of the gas blend or gas mixture by passing the gas blend or gas mixture through a heat exchanger to form a cooled gas blend or gas mixture,

introducing the cooled gas blend or gas mixture into a compression engine as a first fuel component,

introducing a second fuel component into the compression engine comprising a hydrocarbon or hydrocarbon containing fuel for the compression engine,

combusting the first and second fuel components within the compression engine to form exhaust gases, and

passing the exhaust gases through another heat exchanger to extract heat from the exhaust gases, and

transferring the heat to aid the reaction in the hydrogen generator producing the hydrogen containing gas blend or mixture.