Compressed-Air vehicles have too many functional negatives to outweigh the positives. The efficiency just isn't there for them to be practical for daily use by the public.
Compared to an electric vehicle, the Air car will take more electricity to "charge" and a significant portion of that energy will be wasted as heat (no matter what kind of exchange system you setup). There are also more moving parts to service.
The only thing MDI seems to be really good at is roping in investors with spurious claims.
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