11.   Richardson said the price differential between conventional gasoline and the cleaner burning fuel -- about a third of the gasoline sold -- has no justification.

12.   The automaker says the Prius is cleaner and gets better mileage than cars with conventional gasoline engines.

13.   The hybrid system uses a gasoline engine, electric motor and electric generator to achieve nearly twice the fuel efficiency of conventional gasoline engine cars, Toyota said.

14.   The hybrids run on conventional gasoline with an assist under certain driving conditions using power from an electric motor and self-charging generator and battery pack.