BEIJING (AFX-ASIA) – Xinao Gas Holdings (2688 HK) will invest 296 million yuan in four piped-gas supply projects, the South China Morning Post reported. (US$1=8.27 yuan). The Hong Kong-based newspaper quoted Wang Yusuo, chairman, as saying the projects, to be located at Guilin in Guangxi, Tongliao in Inner Mongolia and two in Shangdong province, will…