Knowledge of the thermophysical properties of CO2-hydrocarbon mixtures over extended ranges of temperature and pressure is crucial in the design and operation of many carbon capture and utilization processes. In this paper, we report saturated-phase densities, compressed-liquid densities and phase behaviour of CO2 + methylbenzene at temperatures between (283 and 473) K and at pressures up to 65 MPa over the full composition range. The saturated-phase densities were correlated by a recently-developed empirical equation with an absolute average relative deviation (AARD) of about 0.5 %. The compressed-fluid densities were also correlated using an empirical equation with an AARD of 0.3 %. The new data have been compared with the predictions of two equations of state: the predictive Peng-Robinson (PPR-78) equation of state and the SAFT- Mie equation of state. In both of these models, binary parameters are estimated using functional group contributions. Both models provided satisfactory representation of the vapour-liquid equilibrium and saturated-phase-density data, but the accuracy decreased in the prediction of the compressed-liquid densities where the AARD was about 2 %. The isothermal compressibility and isobaric expansivity are also reported here, and were predicted better with SAFT-γ Mie than with PPR-78. Overall, the comparisons showed that SAFT-γ Mie performs somewhat better than PPR-78 but the results suggest that further refinement of the SAFT-γ Mie parameter table are required.