For greater accuracy in CO₂e calculations, you can specify the fuel type from the following options.

🚚 For road mode

Fuel Type	Description
DIESEL	Standard diesel fuel
CNG	Compressed Natural Gas
LNG	Liquefied Natural Gas
HVO	Hydrotreated Vegetable Oil
ELEC	Electric power; calculations use local emission factors based on the origin
BIOLNG	Bio-based Liquefied Natural Gas
BIOCNG	Bio-based Compressed Natural Gas
BIODIESEL	Bio-based diesel fuel
HYDROGEN_GASEOUS_FCV	Hydrogen fuel for Fuel Cell Vehicles
LPG	Liquefied Petroleum Gas (for vans <3.5t in specific regions)
PETROL	Standard petrol fuel (for vans <3.5t in specific regions)

🚢 For sea mode

Fuel Type	Description
HFO	Heavy Fuel Oil, commonly used in large cargo ships.
VLSFO	Very Low Sulfur Fuel Oil, compliant with IMO 2020 sulfur regulations.
ULSFO	Ultra Low Sulfur Fuel Oil, with even lower sulfur content than VLSFO.
MDO	Marine Diesel Oil, a lighter and more refined fuel than HFO.
MGO	Marine Gas Oil, similar to MDO but with even lower sulfur content.
LNG	Liquefied Natural Gas, a lower-emission alternative fuel.
BIOLNG	Bio-based Liquefied Natural Gas, derived from renewable sources.
LSMGO	Low Sulfur Marine Gas Oil, a cleaner alternative to standard MGO.
METHANOL	Methanol, a clean-burning fuel with reduced emissions.
BIOMETHANOL	Bio-based methanol, produced from renewable feedstocks.
IFO380	Intermediate Fuel Oil (IFO) with a viscosity rating of 380 centistokes.
LNG_CMACGM_VAS	LNG fuel variant used in CMA CGM's Value Added Services (VAS) for eco-friendly shipping.
UCO	Used Cooking Oil, a renewable fuel option derived from waste oils and used in Shipping Lines' Value Added Services (VAS) catalog.
METHANOL_COAL	Methanol derived from coal-based processes.
METHANOL_GAS	Methanol derived from gas-based processes.
METHANOL_RENEWABLES	Methanol produced entirely from renewable energy sources.

The fuel parameter is applicable in the following APIs:

Shipment API: /shipment/v2/report/co2
Run API: /asset/v2/run/co2 (accepted values are only DIESEL, PETROL and LPG).

If no fuel is specified: the API defaults to the vessel’s least green fuel option, ensuring compliance with GLEC’s conservative approach for emissions assumptions.
For sea mode:
- Fuel input requires a vessel specification (name or imo) for accurate emissions modeling.
- Dual-fuel vessels: user input prevails if the vessel can operate on the specified fuel (e.g., ULSFO instead of HFO, or LNG instead of HFO for LNG-compatible ships).
- Compatibility rules: the vessel’s fuel configuration takes precedence when the input fuel is incompatible (e.g., LNG or Methanol cannot be used on a vessel designed for HFO only). Fuel compatibility is verified using our vessel database, which includes detailed vessels configurations.
- HFO, VLSFO, and ULSFO comply with IMO sulfur regulations and are commonly used in traditional maritime shipping.
For road mode:
- ELEC calculations use local emission factors based on the origin region.
- LPG and PETROL are available for vans weighing less than 3.5t in Europe, South America, Africa, and Asia.
For rail mode
- ELEC calculations are available only for Europe.