Various: Most car companies are racing to bring electric vehicles to the market. But one startup is skipping the high-tech electronics, making cars whose energy source is pulled literally out of thin air. Zero Pollution Motors is trying to bring a car to U.S. roads by early 2011 that’s powered by a combination of compressed air and a small conventional engine. ZPM Chief Executive Shiva Vencat said the ultimate goal is a price tag between $18,000 and $20,000, fuel economy equivalent to …