If you wish to capture the number of miles or kilometres travelled by flight, train, and taxi as part of your company's CO2 reporting, you can currently achieve this utilizing our Custom Field feature and by asking your users to supply the data.
Create a Custom Field on Purchase or Time expenses and select the specific travel category you require the additional data for. This will enable your users to manually input their business journey distance when claiming for an expense where the category has an element of travel.
We recommend that you set your Custom Field Type to either Text or Numerical for your users to input their business travel distance. For more information on how to create a Custom Field, please review our help article Create a custom field.
Our Product Team is currently looking into a dedicated CO2 reporting option, but no set timeframes have been released on when this might be available.