Follow up, the air almost cost me 2 bucks. I thumb in my 4 quarters, the machine comes alive, I set the machine to 35 pounds. I go to the tire that needs the .5 pound as it was closest. I go to the low tire, I removed the cap. The cap falls out of my hand and rolls under the car. I try to retrieve it, but I figure Ill do it later time might run out. The machine shuts off, i get my digital tire gauge, boom 35 pounds. If I needed to do 3 tires I would have been out of luck. Now of course I have a line behind me of everyone in the neighborhood needing air. The car closest to me was very close. I had a bit of a scowl on my face as I approach the driver. I motion to him to lower his window. He flat out refuses. He was waving me off, so I had to shout to him. "I dropped the tire cap under my car, When I pull out, DO NOT take my spot I need the cap". He smiles and waves and gives me the O.K. sign. I get the cap, put it on, and go get the ice cream.