The 2017 Toyota Prius is available as a 5-door, 5-seat hatchback. Starting at $24,685, the 2017 Toyota Prius Two is powered by a 1.8L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 54-mpg in the city and 50-mpg on the highway. The top of the line 2017ToyotaPriusOne , priced at $ 23,475 , is powered by a 1.8L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 54-mpg in the city and 50-mpg on the highway.