The vibrating tube densimeter method along with the Forced Path Mechanical Calibration model, is used to measure the high pressure isothermal p-p behavior of the CO2 + propane system along 17 isotherms between 293 and 343 K, at pressures up to 70 MPa. The compositions cover the range of mole fractions from chiCO(2) = 0.45 to 1.0. The uncertainty in temperatures is +/-0.015 K. The uncertainties in pressures are +/-0013 MPa from 0.1 to 15.0 MPa and +/-0.010 MPa from 5.0 to 70.0 MPa. The precision of the density measurements is +/-0.014 kg m(-3). The minimum global uncertainty is +/-0.204 kg m(-3), based on the calibration of the densimeter with pure water. A generalized Helmholtz energy model for mixtures is used to check the consistency of the new data with respect to previous p-rho-T studies of this mixture. The average absolute deviation of our data with respect to the model is 0.64% which is fully consistent with the assessed accuracy. (C) 2003 Elsevier Science B.V. All rights reserved.