Asia’s very low sulphur fuel oil (VLSFO) cash premium rose to its highest so far this year, extending its climb for a sixth straight session while market backwardation held its strength. The Singapore 0.5% VLSFO cash premium MFO05-SIN-DIF was pegged at $29 a metric ton on Friday, while margin LFO05SGDUBCMc1 closed at a premium of …