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Private passenger vehicles highly contribute to greenhouse gas (GHG) emissions (CO2). Increasing the fuel economy of private vehicles have been the main goal for reducing fossil fuel consumption and GHG emissions. The increase in fuel economy of commercial vehicles has been the main objective to reduce fuel consumption and CO2 emissions. One of technology is hybrid electric vehicles. This paper analyses the fuel economy of hybrid electric vehicles (HEV) and plug-in hybrid vehicles (PHEV) and compared to the conventional gasoline engine vehicles. The fuel economy data were recorded from 2 gasoline engine cars, 2 hybrid electric cars, and 2 plug-in hybrid electric cars; during six weeks daily driving with mileage 25-50 km/day each car. Those six cars were driven by six different drivers. The results show that the fuel economy of the HEV is in the range of 22.4 to 13.1 km/l, for the PHEV, the fuel economy is in the range of 55.4 to 88 km/l, and in the range of 10.1 to 12.9 km/l for the gasoline engine cars. The PHEV had the highest fuel economy and very wide variation in fuel economy. This was affected by the availability of the charging facility, the easiness to access the charging station, and the commitment of the driver itself to do charging the car. Fuel economy of the HEVs was the most consistent in any situation of driving. As for the gasoline engine cars, the traffic condition has a quite big impact on the fuel economy. The estimated fuel consumption reductions for the HEVs and PHEVs were about 56% and in the range of 60% to 85%, respectively. The estimated CO2 reductions were about 48% for the HEVs and about 55% for the PHEVs.