The New York State Energy Research and Development Authority (NYSERDA), under its Alternative Fuels for Vehicles Fleet Demonstration Program (AFV-FDP), established a number of light-duty CNG vehicle fleet demonstrations throughout New York State to collect data from CNG vehicle operation. The majority of the vehicles were converted from gasoline operation to bifuel1 operation, though dedicated CNG vehicles (new and converted) were also included. Pickups, vans, station wagons, and sport utility vehicles were all represented. The vehicles were tracked for mileage accumulation and service experience, and emissions were measured using the Federal Test Procedure. The types of CNG fuel system technologies represented were mechanical open-loop (MOL), mechanical closed-loop (MCL), electronic single-point injection closed-loop (ESPCL), and electronic multipoint injection closed-loop (EMPCL). During the course of the AFV-FDP, the CNG vehicles accumulated a total of 2.4 million kilometers (1.5 million miles) of operation, of which approximately 1.3 million kilometers (800 thousand miles) were on CNG.