Temperature-induced percolation behavior in mixed reverse micellar systems (RMs) comprising sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and polyoxyethylene(20) sorbitan trioleate (Tween-85) in polar lipophilic oils e. g., ethyl oleate (EO), isopropyl myristate (IPM) and isopropyl palmitate (IPP) was studied at a total surfactant concentration (S-T) of 0.25 .10(3) mol . m (3) in absence and presence of the additives (acetyl modified amino acids (MAA) of different chemical structures). The threshold temperature of percolation (T-p) of these systems was found to be dependent on water content (omega), content of nonionic surfactant (XTween-85), and concentration of NaCl. The standard free energy change (Delta G(cl)(0)), enthalpy change (Delta H-cl(0)) and entropy change (Delta S-cl(0)) of cluster formation were evaluated based on an association model at different physicochemical environments. The clustering process was spontaneous and found to be endothermic and entropically driven. Scaling laws for the temperature-induced percolation demonstrated dynamic nature of the percolation process. The activation energy, E-p of these systems was estimated both in absence and presence of additives. Droplet sizes of these systems were measured using dynamic light scattering (DLS) technique at different physicochemical environments (comparable to conductivity measurements) to underline the factors governed the percolation process. The chemical structure of the oils played an important role in influencing T-p, E-p, thermodynamic parameters and droplet size of these systems in absence and presence of the additives. An attempt has been made to underline the microstructures of these systems in the light of percolation of conductance vis-a-vis thermodynamics of droplet clustering and droplet dimensions. (C) 2013 Elsevier Ltd. All rights reserved.