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What is average? How is it stored?

Mine is in containers along the top shelf above the loading bench in the garage. About 15lb all up, although that includes an 8lb jug of 748.

If it burns it...

No. But then again I would expect them to already know that barbeques often have LPG bottles and cars are likely to contain petrol and to take what precautions are necessary when they see one in, or...

Except that his firemen are the ones who would be fighting a fire in a room or garage with all kinds of explosive in it and no warning.