Nissan North America, Inc. is featuring a range of its environmentally conscious vehicles at the 6th annual Clean Cities Conference May 7 to 10 in San Diego, including the cleanest gasoline-fueled vehicle in the world. The Clean Cities Conference, sponsored by the U.S. Department of Energy, promotes the development and implementation of environmentally friendly vehicles. Nissan's range of production and experimental vehicles showcase the company's commitment to the concepts espoused by the Clean Cities Conference. Headlining Nissan's news at the conference will be the Nissan Sentra CA, the cleanest gasoline-powered vehicle in the world. The CA is now on sale in limited volume throughout California priced at just $14,799.