I'll admit that I like free air. Who doesn't? You pull into the gas station, find the compressor, inflate your tires to the recommended pressure (thus saving at least one polar bear), and drive off. What's not to like? People resent — I resent — having to insert quarters. "Why do I have to pay for air?" But as a business guy, I suspect that an air compressor is a fairly expensive piece of equipment. Then there's the electricity to run it, maintenance, the salary of the guy who has to go out and unkink the hose every day. And...