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The ever-increasing energy demand is a prime concern of entire world. As gasoline prices soar and concern over harmful emissions mount, vehicles which run on alternate fuel sources like LPG and CNG are becoming increasingly important. In this experimental study single cylinder pickup van engine was tested as per IS 14599 by using LPG and CNG as fuel. Ordinary fuel for vehicle is gasoline. Full throttle performance was tested at different speeds on computerized engine test set up with data acquisition system and AVL eddy current dynamometer. Important performance characteristic curves have been investigated and compared in CNG mode and LPG mode. Curve fitting has been done and equations with regression coefficient have been derived. Statistical analysis for different engine parameters has been done in LPG and CNG mode by using matlab software. It was observed that maximum power and maximum torque in LPG mode was more than that in CNG mode.