AutoZone is up 4,000% in just the past two decades, yet its growth story could have many miles to go.With more than 6,400 stores in the United States, nearly 800 locations in Mexico, and 127 shops in Brazil, AutoZone (AZO 0.57%) is a leading retailer of automobile replacement parts and accessories across the Americas. Over the last 20 years, AutoZone has delivered total returns of roughly 4,000%, making it a 41-bagger in a relatively short period -- for true long-term investors, at least. These results are ...