Last, but certainly not least, is the famed Ford Mustang. Take everything you knew about Mustang fuel-efficiency and throw it out the window. The Mustang squeezes 305-horsepower out its V-6 engine, which allows it to go from 0 to 60 in just 5.8 seconds. But if you think this is going to hurt the Mustang's fuel economy, think again. The city mileage comes in at 19 miles per gallon (8.1 kilometers per liter) and the highway mileage goes all the way up to 31 miles per gallon (13.2 kilometers per liter). With horsepower and gas mileage numbers like that, the Mustang shows you can have brains and brawn at the same time.