gas oil
liquid oilDESNZ 2025 'Gas oil' — the UK term for off-road diesel, dyed red for duty purposes and used in agriculture, construction and static plant. Chemically close to road diesel but NOT the same numbers: 853.971 kg/m³ and 2.75541 kgCO2e/L against road diesel's 832.361 kg/m³ and 2.57082 kgCO2e/L, about 7% more CO2e per litre. Note DESNZ publishes no kWh-per-litre calorific value for this fuel, so per-litre energy is derived from mass via the density above and labeled accordingly.
Easily confused with
Different products with different numbers. Check you are on the right one.
- diesel 832.361 kg/m³ 2.57082 kgCO2e/L
- 100% mineral diesel 830.565 kg/m³ 2.66155 kgCO2e/L
- fuel oil 983.284 kg/m³ 3.17492 kgCO2e/L
Density
853.971 kg/m³
at 15 °C (fuel-properties basis)
Heating values
Emission factors
| Metric | Value | Scope | Region / year | Source |
|---|---|---|---|---|
| CO₂ | 2.72417 kgCO2/L | direct combustion | UK · 2025 | |
| CO₂e | 2.75541 kgCO2e/L | direct combustion | UK · 2025 |
CO₂ ≠ CO₂e — separate metrics, never converted into one another. What these metrics mean →
Worked example
Open in converter →Conversion results
Energy
Same energy expressed in other units.
Mass
Volume
Emissions
CO₂ and CO₂e are separate — never derived from each other.
Energy density
Energy per unit of mass or volume.
Assumptions
- density: assumed gas oil density 853.971 kg/m³ at 15 °C (fuel-properties basis)
- heating value basis: energy on LHV/NCV basis, 42.569 MJ/kg
- heating value basis: energy on HHV/GCV basis, 45.286 MJ/kg
Sources
Follow each source back to its primary document — that traceability is the point. How conversions work →