Accelerated Composites is a small company, based in San Diego, California that has reportedly developed a 230 mpg hybrid vehicle. The two-seat vehicle, called the Aptera, is currently a prototype. The retail version, scheduled to be introduced to the market in late 2008, will initially only be available to residents of California. Apteras can be reserved for a down-payment of $500. According to the company, the Aptera's fuel efficiency is due largely to a lightweight composite construction and aerodynamic design.