CARLSBAD, Calif. ? Accelerated Composites LLC, a small startup company here, said it is developing the Aptera, a two-seat hybrid passenger car delivering 330 mpg at a steady 65 miles per hour ? at a price under $20,000. California company Accelerated Composites is developing this three-wheel hybrid and says it may be on sale as early as 2008. .. The prototype under construction will be powered by a single-cylinder, 12-horsepower diesel engine and a 24-horsepower DC electric motor, and will have a continuously variable transmission. Power is delivered through a single rear wheel mounted on a composite swing arm. The car is expected to have an electronically limited top speed of 95 miles per hour and an estimated 0-to-60-mph acceleration of 11 seconds.