Help Can LGP work as a method?

[ToothFairy]

Liquefied Petroleum Gas is the gas that kitchen gas cylinders have, although LPG is not inherently toxic or poisonous, it is heavier than air and accumulates progressively from the ground up, displacing oxygen in enclosed spaces.

I'm wondering if people here know about this being used as a method and if it could work consistently as one.

 

[ToothFairy]

still wondering about this

 

[Forveleth]

Thus appears to be a mix of propane and butane, both highly flammable gases. I would be nervous filling any amount of space with those. Also, they sometimes put smelly stuff in it so people can detect leaks so you might have to deal with that.