State-run oil marketer and refiner Hindustan Petroleum Corp (HPCL) on Wednesday reported an 86% increase in net profit to Rs 1,719 crore in the April-June 2018 period, from Rs 925 crore in the comparable period a year ago, driven mainly by strong refining margins. The company, now a subsidiary of the national explorer ONGC, reported a revenue of Rs 72,923 crore for the June 2018 quarter, compared with Rs 59,891 crore a year ago.