This paper reports experimental densities and refractive indices of the binary systems tert-butyl alcohol (TBA) + toluene, + isooctane, and + methylcyclohexane, and toluene + methylcyclohexane, and the ternary system TEA + toluene + methylcyclohexane, over the entire range of composition at 298.15 K. Excess molar volumes and changes of refractive indices were evaluated from the experimental data obtained. These derived properties were fitted to variable-degree polynomials. The experimental values of physical properties were compared with the values estimated by different methods of prediction.