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They use inner tubes in India for hand-tractors. Allows you to store at a higher pressure without spending too much on it.
I think the problem with the gas bag is, since it's unpressurized, it relies on the bag being on top of the car to work. The inner tube's natural tendency to squeeze its contents out through the filler nozzle would probably suffice, and give you more range.
I've found this concept intriguing... you could essentially create a backyard digester, fill a tube, and use it to run a carburetor-equipped engine.
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