Toyota's exploration of hydrogen combustion engines confronts significant obstacles, notably maintenance challenges from extreme cold temperatures required to store liquid hydrogen. Despite its higher energy density than compressed hydrogen gas, practical implementation is hampered by limited range and the need for large fuel tanks.
Maintenance issues, such as the rapid wear of hydrogen fuel pumps due to the inability to use oil lubricants, further compound the viability of hydrogen combustion engines. Efficiency concerns persist, with hydrogen combustion engines exhibiting lower overall efficiency than electric vehicles, potentially undermining their appeal for widespread adoption.
Additionally, BMW's experience with the Hydrogen 7 vehicle highlights the impracticality of long-term liquid hydrogen storage, raising doubts about the feasibility of hydrogen combustion engines for passenger vehicles. Amidst these challenges, the broader transition towards battery electric vehicles appears increasingly compelling, supported by their superior efficiency and simplicity of operation.

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