Spot fuel oil premiums for high sulphur fuel oil (HSFO) declined on Monday, although a flurry of trades at the Singapore window kept the downside limited. The 180-cst HSFO cash differential dipped to $3.23 a tonne, while the 380-cst HSFO cash differential (FO380-SIN-DIF) fell to $7.35 a tonne. In physical markets, PetroChina and P66 continued …