Measurements on density and viscosity at T = (293.15, 298.15, 303.15, 308.15 313.15, 318.15, 323.15, 328.15, and 333.15) K and the pressure P = 0.1 MPa for binary mixtures of n-dodecane or methylcyclohexane with 1-heptanol or cyclohexylmethanol have been carried Out over the whole composition range. Densities were measured with a vibrating-tube densimeter. Viscosities were determined by an automatic microviscometer based on the rolling-ball principle. The excess molar volumes (V-m(E)) and viscosity deviations (Delta(eta)) were calculated with experimental data and fitted to the Redlich-Kister equation. The results of these excess or deviation functions are explained by molecular interactions and structural effects. Freezing points were measured With a differential-scanning calorimeter. The fundamental data, V-m(E) and Delta(eta) can be used to study the nature of mixing behaviors between hew hydrocarbon fuels.