The document compares the fuel economy of a Toyota Prius and Ferrari. The Toyota Prius achieves 51 mpg in city driving, 45 mpg on highways, and 46 mpg combined. Each year, the Prius' mpg increases by 2-3 mpg. In contrast, the Ferrari only gets 9 mpg in city driving and 14 mpg on highways, with no improvement in its fuel economy over time. The document notes there is a huge difference in mpg between the economical Prius and the less efficient Ferrari.