Tribune News NetworkDohaPremium-grade gasoline has become a bit cheaper in Qatar as QatarEnergy announces fuel prices for June on Tuesday.Premium-grade gasoline will cost QR1.95 per litre, QR0.05 cheaper than its price in May. The super-grade gasoline will retail at QR2.10 per litre and diesel is priced at QR2.05, the same as their prices in May.