The phase behavior of a water/mixed surfactant/n-propanol/cyclohexane system was studied at various temperatures of 30, 40, and 50 degreesC. The mixed surfactant-n-propanol ratio was kept arbitrarily constant at 0.5. The mixed surfactant was a mixture of anionic sodium dodecyl sulfate and nonionic polyoxyethylene monostearate (Myrj45) at various mole ratios. The effect of salt on the phase behavior was also studied at those temperatures. Phase volume and optimal salinity were obtained for different molefractions of SDS in mixed systems. The water-induced percolation of water/SDS + Myrj45(1:1)/cyclohexane has been studied in detail in the presence of various alcohols as cosurfactants. The percolation threshold was obtained by using the sigmoidal Boltzman equation. The results have been examined in light of the appropriate scaling equation, and the activation energy for the percolation process was computed.