According to the United States Environmental Protection Agency, in 2007, the 2008 Prius is the most fuel efficient car sold in the U.S. The UK Department for Transport also reported the Prius is tied as the sixth least CO2-emitting vehicle on sale in the UK.
1997–2000 (model NHW10)
The first Prius, model NHW10, went on sale in December 1997. It was sold only in Japan, though it has been imported privately to the United Kingdom, Australia, and New Zealand. Many of these cars are now being exported as second-hand vehicles to New Zealand and other countries.
2001–2003 (model NHW11)
The 2001–2003 Prius for the United States market was powered by a 1.5-liter 4 cylinder gasoline engine, a permanent magnet AC electric motor, and a 274-volt nickel-metal hydride (Ni-MH) battery pack. The gasoline engine developed 70hp (52kW) and 82ft·lbf (111N·m) of torque. The electric motor generated a maximum of 44hp (33kW) and 258ft·lbf (350N·m) of torque. Japanese versions were less powerful.