John Fredriksen's Avance Gas can look forward to useful savings from its new series of dual-fuel VLGCs.

The Oslo-listed company contracted another two 91,000-cbm ships at South Korea's Daewoo Shipbuilding & Marine Engineering on Monday, adding to the two it ordered there in December.

Norwegian investment bank Fearnley Securities estimates cost savings of between $4,000 and $5,000 per day from running on LPG, which involves burning six tonnes per day less fuel.