Qatar Petroleum on Monday set fuel prices in the State for June 2021. The prices saw a marginal increase with diesel set at QR1.75 a litre, compared to QR1.65in May, while super gasoline 95 is costing QR1.90 per litre as against QR1.85 last month. The price of premium gasoline 91 has also increased to QR1.85 per litre from QR1.80 in May.