The hint is in him having a 7hp (quite powerful) compressor that apparently runs enough to be running up his electric bill. I'm perplexed by the comment about

The hint is in him having a 7hp (quite powerful) compressor that apparently runs enough to be running up his electric bill. I'm perplexed by the comment about "empty tanks." In these systems the tank is almost never empty because pneumatic tools are pretty useless below a certain pressure; you can't just use them until they're empty. The impact guns I've used became tonka toys around 40 psi or so, if that. The compressor might get shut off for the night, and sure, there are some air leaks - but the next morning when the shop opens, it's not empty. Maybe the reason this dude's compressor is eating him out of house and home is because he's got a bunch of leaks he isn't addressing...