its been widely reported on.
https://www.theguardian.com/environment/2026/feb/18/plug-in-...
https://electrek.co/2026/02/19/biggest-study-yet-shows-plug-...
https://www.theguardian.com/environment/2025/oct/16/plug-in-...
the link to the underlying most recent fraunhofer study referred to by the first two seems broken sadly, so i cant get the breakdown by manufacturer anymore. But the data on aggregate is clear - on average the PHEVs cars out there today spend very little time on average in pure EV mode. If they did there would be more than ~20% reduction in emissions.