Creating hydrogen has always been an energy intensive task. It is impractical to make it from electrolysis and is now usually made from natural gas. Burning it

Creating hydrogen has always been an energy intensive task. It is impractical to make it from electrolysis and is now usually made from natural gas. Burning it may not create carbon but making it usually does. Pure hydrogen will infiltrate most metal making it brittle and cause premature engine failure it is in contact. Hydrogen is not safe long term for engines that have not been redesigned for it. The price is without a reference I doubt any ligitamate company would claim it as it would be trivial to shoot down.