I don’t use a Top Tier gasoline and have never used Techron and have had no fuel quality problems since the tiny fused bronze ball fuel filter on the carburetor on my early 60s car plugged up. I buy gas wherever I am when I need it but mostly from BP and a local farm supply store; don’t know what their fuel brand is. Techron and other mouse milk gasoline additives is, to my thinking, like carrying a lucky rabbit’s foot.