A major sticking point for automakers investigating compressed natural gas, or CNG vehicles are the large (and expensive) fuel tanks that store comparatively little fuel. Chrysler may have come up with the solution, using a series of smaller tanks inside a larger tank to mimic the human lung, resulting in smaller tanks with more fuel.

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via Gas 2 http://gas2.org/2013/11/14/chrysler-develops-cng-storage-mimics-human-lung/