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Porsche’s hydrogen engine beats V8s – TopAuto
https://topauto.co.za/features/65173/porsches-hydrogen-engine-beats-v8s/

The lean fuel further offers consumption advantages of up to 5% over equivalent gasoline, and offers “high efficiency in the WLTP (driving range) measurement cycle as well as in customer-relevant cycles.”
この部分じゃないかな