The increase comes a month after MGL raised CNG prices by Re 1 per kg to Rs 89 per kg from October 1. Prior to that, in September, the company had increased the price by Rs 2 per kg, taking it to. CNG prices in Mumbai have reached ₹90 per kg following a ₹1 increase effective October 31. Mahanagar Gas Limited attributed the hike to rising input costs and international gas prices..