Novel isothermal phase equilibrium data were measured, via the static analytic (SA) and static synthetic (SS) techniques, for the binary mixtures of tetrafluoromethane with either perfluoroheptane or perfluorodecalin. The experimental data were correlated using the Peng-Robinson equation of state using either the classical or the Wong-Sandler mixing rules. For both binary systems, the models provide an excellent fit to the data and the Wong-Sandler mixing rule marginally outperformed the classical mixing rule. The uncertainty of the pressure, temperature, and average liquid- and vapor-phase compositions for the SA apparatus were 0.01 MPa, 0.09 K, and 0.012 and 0.0014, respectively. The uncertainty of the pressure, temperature, and average liquid-phase composition for the SS apparatus were 0.01 MPa, 0.07 K, and 0.009, respectively.