It's nonsense. There isn't even a national standard for premium, so 93 isn't the minimum. https://en.m.wikipedia.org/wiki/List_of_U.S._states_by_standard_octa

It's nonsense. There isn't even a national standard for premium, so 93 isn't the minimum. https://en.m.wikipedia.org/wiki/List_of_U.S._states_by_standard_octane_ratings https://en.m.wikipedia.org/wiki/List_of_U.S._states_by_stand... You can go buy ethanal free gasoline in lots of areas (often called recreation fuel here). The gas component has to have a high average octane without the added ethanol.