The 2018 Toyota Prius Prime is the plug-in variant of Toyota's immensely popular Prius hybrid hatchback model. In its third year of production, the Prime is essentially a 4th-generation Prius that offers a significantly larger battery capacity, translating to up to 25 miles of electric-only driving. It features a 1.8L I4 hybrid engine producing 121 horsepower, mated to an electronically controlled continuously variable transmission (eCVT). Its economy-centric profile does not sacrifice technology, with available 11.6-inch touchscreen infotainment system, satellite navigation, and Toyota's Safety Sense package including adaptive cruise control and collision mitigation. It is available in three trim levels: Plus, Premium, and Advanced.