American cars travel two-and-a-half trillion miles in a year - that's five million round trips to the moon! SeeMore about the history and uses of the automobile, from the Mercedes-Benz to today's sleek racing vehicles.American cars travel two-and-a-half trillion miles in a year - that's five million round trips to the moon! SeeMore about the history and uses of the automobile, from the Mercedes-Benz to today's sleek racing vehicles.