Cheaper alternatives, high energy demand for production, questionable environmental footprint and possible obstacle to transforming the transport sector: There are manifold reasons not to use synthetic fuels produced with electricity in cars and trucks. This is the conclusion of a new discussion paper by Fraunhofer ISI. Based on scientific findings, it takes a critical view of the German government’s recent decision that plans to allow e-fuels a major role in achieving climate neutrality in the transport sector in the future.