The measured dry volumetric products of combustion of a hydrocarbon fuel of unknown

composition are found to be: $28\mathrm{.}2\%$ CO$2,2\mathrm{.}1\%$ O$2,18\mathrm{.}5\%$ CO$,1\mathrm{.}6\%$ H$2$ and $2\mathrm{.}6\%$ CH$4.$

Calculate: The composition of the fuel and the equivalence ratio.