Reuters: A car that runs on air? What seemed like a pipe dream may soon become reality as Frenchman Guy Negre hopes versions of his compressed air car will be produced in India this year by Tata Motors Ltd after a 15 year quest for backers for his invention. Negre believes the time is right for his design with oil prices at record highs and pressure on carmakers to improve the fuel efficiency of their vehicles. "It is clear that with oil at US$100 a barrel this will force …