Think about it - can you feasibly run a car on compressed air?
What I read from wikipedia, the technology seems far better than for electric car. Range of 100 km with a tank, charging the tank costs about EUR 2, and in emergency situation you can probably use manual pump to get enough pressure to get to the next station.
The only problem is that a car with a full tank would be rather dangerous in an accident, but I guess they could work around that. Link. The article (and the related articles) are rather badly written though, going from EUR to USD inside one sentence as comparisons, but I guess we can manage.