The 2010 Toyota Prius is available as a 5-door, 5-seat hatchback. Starting at $22,800, the 2010 Toyota Prius II is powered by a 1.8L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 51-mpg in the city and 48-mpg on the highway. The top of the line 2010 Toyota Prius I, priced at $21,400, is powered by a 1.8L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 51-mpg in the city and 48-mpg on the highway.