They want to reduce the tank capacity to 15 l. There is a proposal for major changes in cars

Plug-in hybrids are primarily designed to run on electric energy, but many users treat them like conventional cars, leading to higher emissions than expected. A study revealed that these vehicles emitted an average of 145 g CO2 per kilometer, significantly more than the homologation tests indicated. The organization Transport & Environment suggests reducing fuel tank sizes to promote electric driving and proposes that by 2030, plug-in hybrids should have a real electric range of at least 200 km. However, this proposal faces criticism from the automotive industry, which argues it interferes too much with vehicle design and that manufacturers are already improving electric ranges.