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Here's an update to the buildhttps://www.youtube.com/watch?v=WJRGava4YQo
I don't advise doing it but some guys compress it in to propane tanks. Back in the day they would store it in balloons ( g. ) weather balloon. Prior to ww2 in Europe you see many cars driving around with balloons on their roof.
Free Gas ! Freeedom !View Instructable »