For city commuters who often contend with tight parking spaces and high fuel costs, the Smart fortwo is here to solve both problems. The Smart's small size means it parks like a dream in almost any space. According to the EPA, the Smart is rated at 34 mpg in the city and 38 mpg on the highway, for a combined 36 mpg, making it not only one of the smallest cars available in the U.S., but one of the most efficient.