• AutoZone average gross margin for 2023 was 51.89%, a 0.48% increase from 2022.
• AutoZone average gross margin for 2022 was 52.14%, a 1.49% decline from 2021.
• AutoZone average gross margin for 2021 was 52.93%, a 1.31% decline from 2020.

Gross margin can be defined as a company's total sales revenue minus its cost of goods sold, divided by the total sales revenue, expressed as a percentage.