Many experts consider hydrogen to be the fuel of the future. Most of them envisage the conversion of hydrogen into electrical energy, which is then stored in batteries until required. The actual drive is provided by an electric motor. By contrast, BMW spent many years optimising internal combustion engines for use with hydrogen. The high points of this development were the speed records set by the futuristic H₂R in 2004, which exceeded 300 km/h. The BMW Group achieved these following a comprehensive research programme into hydrogen technology – from filling and storage at minus 253° Celsius to combustion. Among other reasons, BMW abandoned the combustion principle for hydrogen on account of the high fuel losses during storage and conversion, and the records were consigned to the annals of technical history. Nevertheless, a great deal of expertise and several valuable patents survived the period and could well make a reappearance in future developments.