Isothermal vapor-liquid equilibrium data at 333.15 K are reported for the ternary system di-isopropyl ether (DIPE) + n-propyl alcohol + toluene and the binary subsystems DIPE + n-propyl alcohol, DIPE + toluene and n-propyl alcohol + toluene by using headspace gas chromatography. The excess molar volumes at 298.15 K for the same binary and ternary systems were also determined by directly measured densities. The experimental binary and ternary vapor-liquid equilibrium data were correlated with different G(E) models and the excess molar Volumes were correlated with the Redlich-Kister equation for the binary systems and the Cibulka equation for the ternary system, respectively. (C) 2008 Published by Elsevier B.V.