Back in 1980, Clark bought a 3-wheeled car called the Freeway. It got 100 mpg on a Tecumseh farm engine and had no reverse gear. Once he accelerated too quickly on a highway and the front lifted straight off the ground!

The New York Times now reports that a number of companies are introducing 3-wheel vehicles, including the Piaggio and the Aptera. Obviously, the biggest draw for consumers is fuel economy.

The all-electric Aptera will be available next year in California. Some of the vehicle's features include a top speed of 85 mph; going 0 to 60 in 10 seconds; and getting 120 miles on a single charge. But the price tag is very steep at $30,000. That kind of money ensures that you'll almost never make payback.