The 2017 Toyota Prius is a part of the model's fourth generation, and it's a hybrid that has set a high standard for fuel efficiency and eco-conscious driving. Two power sources – a 1.8L 4-cylinder and an electric motor – combine for 121 horsepower, managed by a continuously variable transmission (CVT) for a smooth, seamless driving feel. All models are front-wheel drive. There are six available trims: One, Two, Two Eco, Three, Three Touring, and Four Touring. All trims come standard with Toyota Safety Sense P, a suite of features including collision mitigation braking, lane departure alert, adaptive cruise control, and automatic high beams. The infotainment system features a 6.1-inch touchscreen, Siri Eyes Free, and an integrated backup camera. Notably, the Two Eco trim achieves an EPA-estimated 56 mpg combined.