Main engine leg Main engine power at voyage load kW Typically 75–85 % MCR for a laden voyage. Main engine SFOC g/kWh Modern two-stroke ≈ 170–180 g/kWh; older plant 190–210. Hours at sea h
Auxiliary load Auxiliary engine power at average load kW Aux SFOC g/kWh Hours auxiliaries running h Usually sea + port hours combined.
Fuels Main engine fuel Heavy Fuel Oil (HFO / RMC..RMK) Very Low Sulphur Fuel Oil (VLSFO, ≤0.50% S) Ultra Low Sulphur Fuel Oil (ULSFO, ≤0.10% S) Light Fuel Oil (LFO / RMA, RMB) Marine Gas Oil (MGO / DMA, DMZ) Marine Diesel Oil (MDO / DMB) LNG - Otto cycle, medium-speed (4-stroke dual-fuel) LNG - Otto cycle, slow-speed (2-stroke low-pressure) LNG - Diesel cycle, slow-speed (2-stroke high-pressure) LPG - Propane LPG - Butane Methanol - grey (natural-gas feedstock) Bio-methanol e-Methanol (RFNBO from renewable H2 + captured CO2) Ammonia - grey (steam-methane reforming) Ammonia - blue (SMR + CCS) Ammonia - green (electrolytic, renewable) Hydrogen - grey (SMR) Hydrogen - green (renewable electrolysis) Bio-LNG (liquefied biomethane, waste feedstock) FAME biodiesel (B100, waste feedstock) HVO / Renewable Diesel (waste feedstock) Auxiliary fuel Heavy Fuel Oil (HFO / RMC..RMK) Very Low Sulphur Fuel Oil (VLSFO, ≤0.50% S) Ultra Low Sulphur Fuel Oil (ULSFO, ≤0.10% S) Light Fuel Oil (LFO / RMA, RMB) Marine Gas Oil (MGO / DMA, DMZ) Marine Diesel Oil (MDO / DMB) LNG - Otto cycle, medium-speed (4-stroke dual-fuel) LNG - Otto cycle, slow-speed (2-stroke low-pressure) LNG - Diesel cycle, slow-speed (2-stroke high-pressure) LPG - Propane LPG - Butane Methanol - grey (natural-gas feedstock) Bio-methanol e-Methanol (RFNBO from renewable H2 + captured CO2) Ammonia - grey (steam-methane reforming) Ammonia - blue (SMR + CCS) Ammonia - green (electrolytic, renewable) Hydrogen - grey (SMR) Hydrogen - green (renewable electrolysis) Bio-LNG (liquefied biomethane, waste feedstock) FAME biodiesel (B100, waste feedstock) HVO / Renewable Diesel (waste feedstock) Formula, assumptions, and limits
Fuel mass in tonnes from delivered power, hours and specific consumption, then Cf conversion for CO₂. Aggregate ME and AE separately so different fuels can carry different Cf.