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This paper discusses experimental outcome of port fuel injected engines operated on gasoline mode and LPG mode. Eight Passenger car PFI engines were tested by using computerized engine data acquisition and control system on gasoline mode and LPG mode. Objectives of this experimental study were 1) To establish generic performance trend for group of newly introduced gasoline/LPG passenger car bi-fuel engines in Indian market. This trend has been established. 2) To compare performance of one sample engine in gasoline and LPG mode. This performance has been compared from performance characteristics curves in both modes. 3) To establish methodology to compare and contrast the performance of various types of Gasoline/LPG passenger car engines. This methodology has been established for a group of engines. 4) To define new normalized figure of merit suitable for the performance comparison of passenger car engines. A parameter power per unit displacement has been defined.