To calculate your mobile combustion emissions, you will need to see what data your organisation has available and choose a calculation method accordingly.
Usually, you can collect this data from the Fleet Manager, Finance Department, or Procurements and Operations team.
If you are new to collecting data on your vehicle fleet, one way of collecting this data is surveying your employees on their average use of company vehicles on a quarterly basis. For the most granular emissions values, however, monthly data is always best.
Note: For hybrid vehicles (PHEV) combustible fuel (i.e. diesel or petrol) and electricity readings must be separated out. Data relating to petrol or diesel should be accounted for in Scope 1 Mobile Combustion, whereas and data related to electricity should be accounted for in Scope 2 Purchased Electricity.
Similarly, electric vehicles (BEV) should be accounted for in Scope 2 Purchased Electricity alone.
Be sure to account for the air conditioning units of the vehicles in the Fugitive Emissions category, especially for summer months.
If you cannot access data in the required formats, see our advice here.