The paper reports experimental p-x data for the ternary system (ethyl 1,1-dimethylethyl ether+ 1-hexene+ toluene) at T = 313.15 K. The ether, synthesized from ethanol of biological origin. increases the interest of this compound as an additive for gasolines. An isothermal total pressure cell was used for the measurements. Data reduction by Barker's method provides correlations for G(E), using Wilson, NRTL, UNIQUAC models and the Wohl expansion for the ternary system and the calculation of the vapor phase composition. Good results are obtained for the correlation by all the models. (C) 2008 Elsevier Ltd. All rights reserved.