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Stopped to check my air pressure at a gas station with one of those pay air compressors.
There was a car in front of me and so I waited. When he finished I pulled up and went to work on mine. I've never trusted the gauges on the end of those hoses. Checked my pressure with my Accu-Gage. I needed a few pounds and started to fill the tires. What a surprise when I noticed the hose gauge said there was 50 psi in the tire. Nope when I checked with my gauge it was 40 psi. I came home and pulled out another air pressure gauge I have and it matched the tire pressures of the Accu-Gage I keep in the car.
Everyone using that hose gauge is running at least eight to ten psi under the recommended pressures.

YES - this is a scam, and should be illegal. I have *NEVER YET* found a gas station air pump with an accurate psi gauge - they ALL read low. 10psi is much lower than I normally see though. Normally it is 3-5psi.

After all, it is in their best interest for your tire pressure to be lower... you use less air AND need more gas!