866-938-9495 The 2011 Toyota Prius is powered by a 1.8-liter four-cylinder engine combined with a pair of electric motorgenerators. They send their power through a specialized continuously variable transmission (CVT). The result is total output of 134 horsepower. In track testing, they clocked the Prius from zero to 60 mph in 10.1 seconds. The most important number, however, is fuel economy. The EPA estimates the 2011 Prius will return a very impressive 51 mpg city48 highway and 50 mpg combined.