Predicting the performance and emissions of an HCCI-DI engine powered by waste cooking oil biodiesel with Al2O3 and FeCl3 nano additives and gasoline injection – A random forest machine learning approach

•Energy utilization from waste cooking oil is extensively studied.•Al2O3 and FeCl3 were used as an ignition enhancer to reduce emissions.•Smoke, HC and CO emissions decreased by doping of Al2O3 and FeCl3 nano additive.•HCCI-DI combustion decreased NOx emissions by 4.3 % compared to conventional DI.•...

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