Is reducing tank capacity to 15 liters the "norm in the EU"? Whose idea is it?

A post by a Polish internet user sparked outrage over alleged EU regulations limiting fuel tank capacity in hybrid vehicles to 15 liters. This claim originated from a report by the NGO Transport & Environment, which suggested such a limit as a proposal to encourage electric vehicle use. However, the EU has not implemented or officially proposed any such regulations. The report discussed potential emissions reductions from plug-in hybrids and included various recommendations, including the fuel tank limit. Many users expressed frustration with the EU's perceived overreach and the impact on personal freedoms.