12 Volt Diving Compressor

[a64pilot]

It is simple physics. It takes X amount of work to compress 80 cu ft of air to 3000 PSI. That is a HUGE X by the way, ask any Scuba shop what their electric bill is.
I don't care if the source is Diesel, gasoline, propane, or electricity, it is still going to take X amount of work, unless you believed as many did that back in the 70's that there was a carburetor that would make your car get 100 MPG, the oil companies owned the patent of course and were keeping it secret