The 2011 Toyota Prius is available as a 5-door, 5-seat hatchback. Starting at $23,520, the 2011 Toyota Prius Two 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 2011 Toyota Prius One, priced at $22,120, 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.