it's slower than a reciprocating saw...

First it turns out that the Unicorn is North Korean, and now this. Bad day for South Korea.

1. You spend energy to compress air. Air heats up, heats up tank, tank cools back down to ambient temperature. Significant energy lost to waste heat. 2. You make your air-car go. Air decompresses, cools down a lot. Significant losses to efficiency. Problems with icing. 3. Your air car stops after half a mile. Your 6-person vehicle doesn't have enough compressed air tank space with current technology to approach the energy density of standard batteries, let alone hydrocarbon fuels. 4. *PROFIT*!