The Mazda Premacy Hydrogen RE Hybrid. It is touted as the most
advanced minivan ever created. You can put either gasoline it, or hydrogen, doesn’t matter which. (Different tanks. Can’t mix gasoline and hydrogen in the same tank. Bad news.) It runs on both. If you fill it with hydrogen, it becomes a zero-emissions vehicle, with a range of 120 miles. The big problem with the hydrogen tank, though, is that hydrogen, as we all know, is a gas.
Gases take up a lot more volume than liquids, since the molecules are so far apart. You can do what you can to squish them together, but you can’t squish them that hard with just a metal tank, because you’re not going to suddenly squish it back into a liquid. That would require much more energy than the hydrogen itself provides, and the last thing you want is a car running on liquid hydrogen.
Start messing around with that, and if you get into an accident, big explosions and such. And liquid hydrogen is very, very cold. And very, very big explosions. Insurance companies won’t be happy and people will probably die.
But anyway. Along with the 150 liter hydrogen tank, it’s got a 25 liter gasoline tank, and an electric battery for hybrid purposes. Though, until hydrogen refueling stations become the norm, the car has limited appeal to those without easy access to some hydrogen. Make the battery a bit bigger, and this car is basically the same as the Chevy Volt, which runs 40 miles on an electric motor and then switches to gas.