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The UK's first public-access hydrogen fueling station – the one opened by Honda just days ago – dispenses hydrogen at 350 bar (5,076 psi) and 700 bar (10,153 psi). The reason is that these are the two standard filling pressures adopted by the world's major automakers, and it requires a lot of technological work to keep the H2 in a tank that pressurized. But what if 500 psi becomes the standard?

According to a report from Pike Research, cumulative sales of fuel cell vehicles (FCVs) will surpass the million-unit milestone by 2020, with total sales hitting 1.2 million by the end of that year. Pike indicates that, between 2010 to 2014, approximately 10,000 FCVs will hit the streets. Following that, the research firm claims that 57,000 FCVs will be sold in 2015, with sales soaring to 390,000 vehicles annually by 2020.

Third-gen Toyota FCHV-adv – Click above for high-res image gallery