German companies such as Daimler Truck, Volvo, TEAL Mobility, and Bosch are advocating for a fairer treatment of hydrogen internal combustion engine (ICE) vehicles in terms of taxation. Currently, under the EU energy tax directive, hydrogen fuel cell vehicles are exempt from energy tax, while hydrogen engines are charged a fee, which is set to increase in the future. These companies argue that this tax disparity distorts competition and impedes the development of hydrogen ICE technology. They highlight that many hydrogen refueling stations are hesitant to serve engine-powered vehicles due to uncertainties surrounding taxes. The proponents of hydrogen ICE vehicles emphasize that these engines operate similarly to traditional petrol or diesel engines but use hydrogen as fuel, emitting no CO2 but small volumes of NOx. Despite this, they stress that hydrogen ICEs should receive similar tax relief as other clean mobility solutions to accelerate their adoption, especially in the early stages of the technology. By extending tax exemptions to hydrogen ICE vehicles, the companies believe that the uptake of hydrogen-powered transport could be expedited, ultimately enhancing the EU's manufacturing competitiveness. The signatories of the letter to the German Government also call for fair treatments across different technologies and urge for the implementation of tax exemptions on hydrogen ICEs. They believe that the positive momentum of hydrogen engines can significantly contribute to the hydrogen economy and boost the utilization of hydrogen in transport. Although hydrogen ICEs have faced concerns regarding NOx emissions, developers assure that these engines will comply with legal emissions requirements in the future. The push for tax exemptions for hydrogen ICE vehicles reflects the growing interest in hydrogen as a cleaner alternative in the transportation sector. Advocates see these vehicles as pivotal in advancing hydrogen technology and reducing carbon emissions, despite the challenges they may pose in terms of NOx emissions. By promoting fair treatment and tax incentives, stakeholders aim to drive the widespread adoption of hydrogen ICE vehicles and bolster the hydrogen economy.