The ignition temperature of nitrogen-diluted mixtures of methane and ethylene counterflowing against heated air was measured up to 5 atmospheres. In addition, the stretch-corrected laminar flame speeds of mixtures of air, methane and ethylene were determined from the outwardly propagating spherical flame of up to 10 atmospheres, for extensive range of the lean-to-rich equivalence ratio. These experimental data, relevant to low-temperature ignition chemistry and high-temperature flame chemistry, respectively, were subsequently compared with calculations using two detailed kinetic mechanisms. Furthermore, the hierarchical structure of the associated oxidation kinetics was examined by comparing the sizes and constituents of the skeletal mechanisms of the pure fuels and their mixtures, derived using the method of directed relation graph (DRG). The skeletal mechanism was further reduced by the time-scale analysis and a 24- species reduced mechanism was obtained from the detailed mechanism of USC Mech II, valid within the parameter space of the conducted experiments.