Vapor-liquid equilibrium (VLE) data are reported for the binary mixtures formed by 2,2-dimethylbutane and the branched ether 1,1-dimethylpropyl methyl ether (tert-amyl methyl ether or TAME). A Gibbs-van Ness type apparatus was used to obtain total vapor pressure measurements as a function of composition at 298.15, 318.15, and 338.15 K. Deviations from Raoult's law are positive and very small. These VLE data are analyzed together with excess enthalpy (H-m(E)) data previously reported at 298.15 K using the UNIQUAC model. The modified UNIFAC (Dortmund) model is used to predict VLE data. (C) 2004 Elsevier B.V. All rights reserved.