NEW: Toyota unveils 2010 Prius that boasts 50 mpg

    DETROIT (AP) - Toyota is looking to keep the Prius in its spot as the top-selling hybrid in the U.S. with the next generation of the iconic fuel-sipper.
    The highly anticipated 2010 Prius being unveiled Monday at the North American International Auto Show in Detroit gets an average of 50 miles to the gallon. That’s a 4 mpg improvement over the current model, which already is the most fuel-efficient vehicle ranked by the Environmental Protection Agency.
    The third generation gas-electric Prius has a more aerodynamic design, but its exterior is easily recognizable as a Prius. Toyota says pricing will be released before the midsize sedan goes on sale in late spring.
    Toyota Motor Corp. also will offer options such as a moonroof with solar panels to power the ventilation system.