It seems that Amoco had introduced unleaded gasoline in the 1930's as a premium fuel. Despite Amoco being owned by Standard of Indiana, it was solely available at Amoco stations in the Eastern US until at least the late 1950's or early 1960's. The photo is of a 1960's-era pump decal used by Amoco.
Last edited by phmlpn; Fri Sep 24 2021 03:23 PM.