(EnergyAsia, October 7 2010, Thursday) — US-listed Sino Gas International Holdings said its operating income for the first six months ended June 30, 2010 increased by 62.7% to US$1.84 million while its revenue rose to US$12.9 million compared with US$12.4 million for the corresponding period. Revenue from gas sales dropped slightly from US$8.2 million last…