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The Prius first went on sale in Japan in 1997, making it the first mass-produced hybrid vehicle. It was subsequently introduced worldwide in 2001.According to the United States Environmental Protection Agency, the 2008 Prius is the most fuel efficient car sold in the U.S. The computer program used in the Prius shuts off the engine when the car is stopped, is reversing, or is descending hills, thereby dramatically decreasing fuel consumption in city driving . The HSD's on-board computer program determines when and how to use the engine, motor, or both to power the car and recharge the battery so as to maximize efficiency. It has been mentioned that a future Prius will receive an upgrade of the petrol (gasoline) engine from 1.5 litres to 1.8 litres. A plug-in hybrid version of the Prius will allow for lower fuel consumption with a bigger engine. It has also been suggested that a range of different sized models are planned, (referred to by engineers as the Prius A, B and C), rather than a single model. The first of these new models is expected in 2009.Toyota parts center is your #1 stop on the net for Prius parts and accessories.