Hydrogen one explosive element that only needs a dull glow to ignite!
Oxygen one of 3 elements required for fire.
Put em together and they are required to sustain life, and put out fires. Yep it's a created universe!
H2 will also leak, even through steel.
“Hydrogen is much too volatile for vehicular use.”
Nonsense. You are probably thinking “Hindenburg”. You would be wrong. Suggest you read up on it.