Cummins is leading global manufacturer of diesel and natural gas engines, engine-related component products, and electric power generation systems.

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But the problem is that it takes a lot of natural gas to isolate the hydrogen, leaving many to say that it would be more productive to just combust the natural gas in a conventional engine.

FORBES: Hydrogen-Powered Vehicles Could Emerge From Traffic

PowerBox Concept hybrid, for example, shown at the L.A. show, looks a lot like a standard sports utility vehicle (SUV) but combines a supercharged V-6 engine that runs on compressed natural gas and an electric motor that provides added power for acceleration and passing.

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The engine will open up the world of long-distance natural gas trucking.

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Meanwhile the major truck engine manufacturers are developing and manufacturing engines to run directly on natural gas.

FORBES: Sasol's Answer to the Natural Gas Highway: Convert the Fuel