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The paper describes the computational and experimental approach of deriving gross chemical kinetic data of the combustion of common fuels using a motored engine. The approach is based on the accurate calculation of the rate of heat release due to autoignition reactions. Kinetic data of the combustion of n-heptane, propane, and methane in air together with the role of the presence of a higher hydrocarbon vapour such as n-heptane with methane and propane are presented and discussed mainly in relation to dual-fuel engine phenomena.