Originally Posted by
TurnipEaterDown
Something else happened in your related experience.
Gasoline with Ethanol (10 -15%), or "straight" gasoline w/o oxygenated additives, is available in various markets for use in on road automotive application. ALL "modern" US Market automobiles w/ gasoline engines can use either the EPA approved oxygenated blends or "straight" gasoline.
The blend of oxygenates depends on Market and Season, and is mandated in some specific aspects by the US EPA.
Leaded fuel (gasoline containing tetraethyllead) will "poison" a catalytic converter. "Recreational fuel" can, and in some instances does, contain TEL to this day.
There are also other additives that can "poison" a modern automotive gasoline IC engine catalyst, but "pure" gasoline can not.
I have relevant professional experience to make this statement.