Sequence: Failed inspection (Atlanta, GA, 2004 Rav4, code=P0420), added to 3/4 tank of regular, all engine check lights went off within 1/2 mile (they’ve been lit since 2006), drove ~200 miles, filled with premium, went for reinspection, easily passed.
https://www.amazon.com/CRC-05063-Guaranteed-Emissions-Formula/dp/B000CIPUR8