Euronav – which has previously suggested ‘eco-ships’ do not exist in the large tanker sector – says a newbuilding suezmax will only save three tonnes of fuel per day compared with a retrofit in perfect sea conditions.

This advantage could easily be lost through poor operations, the tanker owner’s annual report argued.

“The overall gain will not be more than $4m over its lifetime provided that the bunker costs stay as high as they are today,” the report said.

“Taking