Response surface methodology based prediction of engine performance and exhaust emissions of a diesel engine fuelled with canola oil methyl ester J. Renewable Sustainable Energy 5, 033132 (2013); 10.1063/1.4811801 Artificial neural networks based prediction of performance and exhaust emissions in direct injection engine using castor oil biodiesel-diesel blends J. Renewable Sustainable Energy 4, 063130 (2012); 10.1063/1.4769200 Effect of palm methyl ester-diesel blends performance and emission of a single-cylinder direct-injection diesel engine AIP Conf. Proc. 1440, 562 (2012); 10.1063/1.4704263Investigations on emission characteristics of the pongamia biodiesel-diesel blend fuelled twin cylinder compression ignition direct injection engine using exhaust gas recirculation methodology and dimethyl carbonate as additive Mahua oil ethyl ester was prepared from mahua oil using potassium hydroxide as catalyst by trans-esterification. The important fuel properties of mahua biodiesel blends were compared with those of high speed diesel and biodiesel standards. Variation of brake specific fuel consumption (BSFC), brake thermal efficiency (BTE), P max , CO, NO x , hydrocarbons, and smoke opacity across compression ratio, blending ratio and load were studied successfully using response surface methodology based on Central composite rotatable design. The trends similar to general theory of compression ignition engines (CI) were obtained. Optimum performance and emission parameters were determined by considering the significant variables affecting the diesel engine. Significant reduction in emissions at 23% blending ratio were observed as compared to neat diesel at optimum input variables. Hence mahua biodiesel is an environment friendly alternate fuel over diesel and has good scope to run the compression ignition engines. V C 2013 AIP Publishing LLC. [http://dx.