Here are some numbers that might be a good reference point...

 Here are some numbers that might be a good reference point when hydrogen mobility in Australia is deployed.

"Air Liquide expects to invest over 150 million US dollars to build a liquid hydrogen plant in the western United States, with construction to begin in early 2019. The plant will have a capacity of nearly 30 tons ofhydrogen per day — an amount that can fuel 35,000Fuel Cell Electric Vehicles (FCEVs). Through this investment, Air Liquide will enable the large-scale deployment of hydrogen mobility on the west coast, providing a reliable supply solution to fuel the 40,000 FCEVs expectedto be deployed in the state ofCalifornia by 2022. The plant will also support other fuel cell vehicle and transportation markets in the region, such as material handling and forklifts and heavy duty trucks."

https://www.airliquide.com/media/air-liquide-build-first-world-scale-liquid-hydrogen-production-plant-dedicated-supply-hydrogen-energy-markets