New Delhi, Jan. 2 -- A nationwide price hike for commercial cooking gas announced on Thursday is set to squeeze restaurants and hotels in Delhi, with owners warning of tighter profit margins and difficult choices about passing costs to customers. On Thursday, oil marketing companies increased the price of a 19-kilogramme commercial LGP cylinder by Rs.111. In Delhi, the retail price now stands at Rs.1,691.50, up from Rs.1,580.50. The move directly impacts one of the food service industry's most significant operational expenses, hotel and restaurant owners said. Industry representatives said the timing is particularly challenging, coming at the start of the year when annual menu prices are typically fixed. "Bigger restaurants cannot revise pr...