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...tric efficiency is still roughly five times lower than petrol. This is why hydrogen must be compressed if there is to be a useful amount of stored energy. ...troleum Gas]], [[Vapourized Petroleum Gas]], [[Compressed Natural Gas]], [[hydrogen]], [[diesel fuel]], [[JP18]] (jet fuel), [[landfill gas]], [[biodiesel]], [

...oil]], [[ethanol]], [[methanol]] (methyl or wood alcohol), and [[hydrogen peroxide]]. Engines that use gases for fuel are called gas engines and those that us ...tric efficiency is still roughly five times lower than petrol. This is why hydrogen must be compressed if there is to be a useful amount of stored energy.

...h an electric spark exploded a mixture of [[Earth's atmosphere|air]] and [[hydrogen]], firing a cork from the end of the gun. ...aac de Rivaz]] built an internal combustion engine powered by a mixture of hydrogen and oxygen.