Every electric car has an official miles per kWh figure from a lab test called WLTP, run at 23°C. It's measured at the plug, so it already counts the electricity lost while charging.
TNO, an independent Dutch research body, studied 45,000 electric cars on Dutch roads. In 2024 they used 22% more electricity than their official figures said, up from 13% in 2020.
Fuelripper takes each car's official figure from the Vehicle Certification Agency (or, for a few older cars, the European Environment Agency), allows 22% more for everyday driving, and takes out the charging loss to give a dashboard figure: 93% of the official one.
A typical new electric car does 3.7 miles per kWh officially, so about 3.4 on its dashboard.
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