Not only do American manufacturers Not make a small efficient car it is illegal to drive a small efficient car in the united states. Scooters are street legal, bicycles are legal, pedestrians are legal. These cars and trucks are legal and popular everywhere in the world except the Unites States, they are legal in Canada.
Here they are rated for off road use only. Our auto manufacturers are going broke because they don't offer anything efficient and inexpensive. They can't! it's illegal to drive them here! For you Minnesotans they also come in a tracked version for use in the snow [Linked Image from japanese4x4minitrucks.com]

Good coffee, good weed, and time on my hands...