Ask whether the gas you buy is filtered at the pump and if the station has a policy about changing the pump filters regularly. If you get a song and dance, find another gas station. Some stations don’t have pump filters, making you more vulnerable to dirty gasoline. Other stations may not mix alcohol and fuel properly—or worse, water down their product. Find a station you trust and stick to it.
This is why you should always be opening your car door with your right hand. It could save a life.