Based on the latest Rapide S sports sedan, it's capable of running on pure gasoline, pure gaseous hydrogen or a mixture of both, which is why "hybrid" has been used in the name even though no electricity is used. In pure hydrogen mode, the only emission the car will make is water as the ignited hydrogen combines with oxygen from the air. The Hybrid Hydrogen system is made up of a hydrogen fuel rail, storage tanks and proprietary engine management system that controls the combustion process according to particular driving situations with the aim of ensuring optimum power, acceleration and CO2 reduction.