Vapor-liquid equilibrium at 94 kPa has been determined for the binary systems of oxolane (tetrahydrofuran) with methyl 1,1-dimethylethyl ether (MTBE) and 2-propanol. Both systems deviate slightly from ideal behavior and do not present an azeotrope. The activity coefficients and boiling point of the solutions were correlated with their composition by the Redlich-Kister, Wohl, Wilson, UNIQUAC, NRTL, and Wisniak-Tamir equations.