While steaming at 12.3 knots, your vessel burns 168 bbls of fuel per day. What will be the rate of fuel consumption if you increase speed to 13.5 knots?

Correct Answer: Option D — 222 bbls

Fuel consumption varies approximately with the cube of the speed. Using Bowditch formulas: New Fuel = Old Fuel × (New Speed / Old Speed)³, yielding 168 × (13.5 / 12.3)³ = 222 barrels per day.