The yacht’s fuel capacity is around 1 million liters. The yacht uses HFO oil, which is 1,149 liters per ton.
Dilbar has a fuel capacity of 1.000.000 / 1,149 = 870 tons. The price of HFO is around $600 per ton
So it costs 870 ton * $600 = $522,000 to fuel her up.
HFO or Heavy fuel oil is the most commonly used fuel for the propulsion of yachts and ships.
Because HFO is the waste product of the refinery process, it is a relatively inexpensive fuel.