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I wonder how they are getting around compressed air's inherent inefficiencies. A lot of heat is produced when air is compressed. On large compressors, this heat is usually removed with a heat exchanger at the output of the compressor, allowing them to store a greater quantity of room temperature compressed air rather then a lesser quantity of heated air. Then when the compressed air is expanded to room pressure, its temperature drops precipitouosly. That air heater they use at speeds over 35mph looks like a method to try to compensate for expansion cooling of their compressed air to increase their range. And if you talk to anyone in industry who runs a compressed air system, compressed air is not cheap to produce and can be one of a plant's larger electrical expenses.
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