[ccsalvesen]

If it exploded; the outcome would have been pretty much the same, but i'm probably wrong. I assume the amount of KJ is about the same; hydrogen will blow up much faster and much more violent. Petrol tend to "wooooof" into an fireball and expell a lot of the energy in the fire afterwards.

A leak in the petrol tanks at a station won't cause explosions in itself, it causes polluted ground water. Not to mention it's quite hard to get petrol to blow up, you need a pretty specific mix of fuel and air.

Hydrogen pretty much blows up no matter what if there is a leak.