The term GASOLINE CHOICE can be summarized by two crossword solutions: AMOCO (5 letters) and LEADED (6 letters). AMOCO is a brand of gasoline that was first introduced in the 1920s and is now owned by BP. LEADED gasoline is a type of fuel that contains lead additives, which were used to increase octane levels and reduce engine knocking. Lead was phased out of gasoline in the 1970s due to its environmental and health risks.