In California, you can’t charge gas customers for air. Might be similar in other states. Try asking them to turn on the air for you.Yes, the main reason I need air is for tires. Those pay to use compressor kiosks at fuel stations are a pain. And most times I need air in much more desolate places. Air horn would be a nice extra thing to have too. Maybe a 12v setup with a little 5 gallon tank is all I need.