Vapor-liquid equilibrium data were determined for the ternary systems 2-methoxy-2-methylpropane + methanol + water and 2-methoxy-2-methylpropane + ethanol + water at 101.32 kPa using a still recycling both liquid and vapor phases. The thermodynamic consistency of the experimental data was confirmed by the Wisniak-LW and McDermott-Ellis tests. The data were correlated using the Wilson, NRTL, and UNIQUAC equations and were compared to predictions obtained using ASOG-KT, UNIFAC, UNIFAC-Dortmund and UNIFAC-Lyngby group contribution methods.