“…It is in this context, that the present study attempts to evolve a GEP model to bridge the gap of exploiting the simplicity and faster iteration speeds of an AI meta-model with that of the explicitness of polynomial regression technique. Due to the inherent advantage of the simplicity of the GEP approach it has already found a wide range of applicability to empirical formulation of various engineering problems where sufficient experimental results exist (Nazari, 2012;Togun and Baysec, 2010;Sarıdemir, 2010;Yang et al, 2013;Hashmi et al, 2011;Nazari and Pacheco Torgal, 2013). The footprint of GEP application in IC engine domains, till date has been very limited where studies investigating its prospects have been restricted to the modelling of performance parameters only .…”