Nach Definition gelten Motoren die mit zwei unterschiedlichen Kraftstoffen betrieben werden können, als bivalentBetriebbivalenter. Dies bedeutet, dass die beiden Kraftstoffe gemeinsam im Fahrzeug mitgeführt werden und eine Umschaltung der Kraftstoffart ohne Hardwareänderung möglich ist.

Natural gas vehicles are a mature technology already available today for solving the environmental problems caused by the automobile. The advantage is based on the features of the main fuel content methane. While keeping a minimum fuel quality standard, it is doesn’t matter to the vehicle technology whether the Methane is several million years old or just a few days. There is complete compatibility between fossil and renewable sources for this most simple of all hydrocarbons. Its highest possible ratio between hydrogen and carbon and the resulting features considering production/availability (fossil & renewable), the justifiable effort in the fuel system and the engine and environmental features make methane an ideal vehicle fuel.