“The smallest automobile in the world - The car had a 4-cylinder air-cooled motor, 3-speeds, electric lights and starter, a 60 inch wheelbase, 21″ x 4″ airplane tires, and weighed 560 pounds. It made 52 mpg and had a top speed of 80 mph. Cost $2,000 to build ($30K in today’s money).”

theoldmotor.com