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The Ship Editor now includes a Fuel section. Set the shared tank capacity, initial fuel quantity and consumption rates for the main propulsion engines. Save JSON and start a new voyage to apply the settings. Editor setting JSON key Tank capacity (L) FuelCapacityLiters Initial fuel (L) InitialFuelLiters Idle consumption per engine (L/h) IdleConsumptionLitersPerHour Full-throttle consumption per engine FullThrottleConsumptionLitersPerHour Capacity: 0.01 to 100,000,000 litres. Initial quantity: 0 to capacity, with the same 100,000,000 litre upper limit. Consumption: 0 to 1,000,000 litres/hour per running engine. Full-throttle consumption must be at least the idle consumption. Example Merge these fields into the existing root-level handling object in boat.json. Keep other handling fields and the rest of your manifest. This snippet is not a complete ship definition. The values illustrate a large-tank configuration and are not a calibrated preset for any real ship. JSON CODE { "handling": { "FuelCapacityLiters": 500000, "InitialFuelLiters": 350000, "IdleConsumptionLitersPerHour": 50, "FullThrottleConsumptionLitersPerHour": 800 } } How consumption works in Across the Seas Only running main engines contribute to consumption. For each running engine, the rate is interpolated linearly between idle and full throttle using the absolute throttle input. Forward and reverse use the same absolute-input rule. With the example above: One engine at idle: 50 L/h One engine at 50% input: 425 L/h One engine at full input: 800 L/h Two engines at full input: 1,600 L/h from the shared tank Stopped engines consume nothing through this calculation. Refuelling is capped at the configured capacity. The existing empty-tank engine-stop behaviour and fuel gauges use the configured tank. Fuel-pump electrical demand is configured separately through the electrical system's fuelPumpLoadKw setting. The rates configure the main propulsion engines. Generator fuel use is not added by these settings.