From the Net, drip gasoline
It finds its way into your gasoline, particularly from "off brands."
The reason for this post is bring to your attention that there is no single formula for motor fuel in the United States. This needs to be addressed. Gasoline varies by region, climate, season, refiner and seller! You do not know WTF goes into your tank. No wonder when you floorboard that '70 Trans-Am, it pings like you're running on the octane rating of cow piss. It's drip gas the culprit.
The solution is entirely in the hands of the Federal Government. Aviation gasoline is made to a Federally approved formula. 80-87, for example, is the same in Los Angeles as in Miami, summer or winter, Chevron or Union 76. No 80-87 aviation gas can be sold unless it strictly meets the Federal specification for it. That's the way your auto gas MUST be refined, to a uniform, strict formula. Then you will get uniform performance from any pump in the Country. Drip gas will be a footnote in history. And a side benefit, you will never, ever have fuel injector clogging again in your lifetime.