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The Toyota Mirai can store 5kg of hydrogen (giving it a 500km range). This system would require about 150kg of inert material to store the same amount of hydrogen. That's only about three times the weight of a full tank of gas and doesn't seem totally impractical. The other claims sound pretty far-fetched though. For twice the range of an ICE car, it would need a much larger tank.

1. https://insideevs.com/toyota-mirai-fuel-cell-sedan-priced-at...

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It seems reasonable to assume this stuff has a density similar to water, since it’s mostly water anyway. That means you’d need a 150 liter tank to achieve 500km of range. A typical car has, what, a 40 liter tank? And they’re promising more like 1,200km of range from that size tank.

60% water, so it depends on what the other 37% is

Even if the other 37% takes up no space at all, it still doesn’t come close to adding up.

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