[supercat]

The lights dim for blocks around when it is turned on, so I have serious questions weather this car will save any energy.

Unless there is some useful way of harnessing the heat given off in compression, the system is going to be horrendously inefficient.

[AntiBurr]

You are apparently unaware of multi-stage compressors. They take far less power to produce high pressure than sigle stage compressors. I daily start one electric motor which does indeed turn out the 1000 watt mercury light. It is 350 HP and starts an impeller weighing about 10 tons.