Triad Auto World has this 3-wheeled vehicle for sale on it’s lot. It’s the Wildfire 650c.
This tiny vehicle has four seats and, according to WildfireMotors.com, it gets up to 60 mpg. The EPA certificate on the site says it is classified as a motorcycle, and has a 4-stroke, 2-cylinder, 644 cc engine. Cruising speed is 45 mph. I haven’t found out if it has a heater or air conditioner. While you are waiting for your smart fortwo™ or Toyota Prius to arrive, check out the Wildfire on Battleground Ave next to Higgins Cycles in Greensboro.
See also the Youtube video by WHEC in Rochester, New York.