Many automobile fueling stations have had "pay for air" machines for at least a decade. If you do not like paying for compressed air, you are free to buy your fuel from stations that do not charge for the service. That is part of the benefit of living in a competitive and diverse economy. Air is not free, at least not when someone must pay to compress and store it. In fact, some of us have paid for air compressors and electricity to power them so we can keep our autos safe by regularly inflating our tires in our own garages.

Keith Eilers

Evanston, Wyo.