Car methodologies
Car results are per vehicle, whatever the number of passengers. Methods range from rental category averages to the CO₂ rating of a specific model. Methods that count tailpipe CO₂ only show electric cars as zero.
| Methodology | Best for | Data used | Energy scope | Factor year |
|---|---|---|---|---|
| ACRISSACRISS (car rental industry standards body) | Rental bookings with a car category code | Averages by rental category and fuel | TTW, tailpipe CO₂ | No |
| DEFRAUK Government (DESNZ) | UK-based reporting and cars of unknown model | UK averages by car size and fuel | WTW, TTW optional | Yes |
| BASICSQUAKE, using your data | Fleets or cars with a known CO₂ rate or consumption | Your own CO₂ rate or consumption | Depends on your data | No |
| EU EEAEuropean Environment Agency (EEA) | Cars registered in Europe with a known make, model and year | Type-approval data for the model | Type-approval data | No |
| US EPAUS EPA, with the US Department of Energy (FuelEconomy.gov) | US vehicles and US corporate inventories | A specific US model, or an EPA average | TTW | Yes |