Have you been paying attention to shares of AutoZone (AZO)? Shares have been on the move with the stock up 3.9% over the past month. The stock hit a new 52-week high of $802.22 in the previous session. AutoZone has gained 12.3% since the start of the year compared to the 9.9% move for the Zacks Retail-Wholesale sector and the 30% return for the Zacks Automotive - Retail and Wholesale - Parts industry.What's Driving the Outperformance?The stock has an impressive record of positive earnings surprises, as it hasn't missed our earnings consensus estimate in any of the last four quarters. In its last earnings report on September 18, 2018, AutoZone reported EPS of $18.54 versus consensus estimate of $17.88 while it missed the consensus revenue estimate by 0.76%.For the current fiscal year, AutoZone is expected to post earnings of $58.44 per share on $11.77 billion in revenues. This represents a 16.09% change in EPS on a 4.87% change in revenues. For the next fiscal year, the company is expected to earn $62.21 per share on $11.98 billion in revenues. This represents a year-over-year change of 6.45% and 1.82%, respectively.Valuation MetricsAutoZone may be at a 52-week high right now, but what might the future hold for the stock? A key aspect of this question is taking a look at valuation metrics in order to determine if the company is due for a pullback from this level.On this front, we can look at the Zacks Style Scores, as these give investors a variety of ways to comb through stocks (beyond looking at the Zacks Rank of a security). These styles are represented by grades running from A to F in the categories of Value, Growth, and Momentum, while there is a combined VGM Score as well. The idea behind the style scores is to help investors pick the most appropriate Zacks Rank stocks based on their individual investment style.AutoZone has a Value Score of B. The stock's Growth and Momentum Scores are A and C, respectively, giving the company a VGM Score of A.In terms of its value breakdown, the stock currently trades at 13.7X current fiscal year EPS estimates. On a trailing cash flow basis, the stock currently trades at 12.2X versus its peer group's average of 14.2X. Additionally, the stock has a PEG ratio of 1.12. This isn't enough to put the company in the top echelon of all stocks we cover from a value perspective.Zacks RankWe also need to look at the Zacks Rank for the stock, as this supersedes any trend on the style score front. Fortunately, AutoZone currently has a Zacks Rank of #2 (Buy) thanks to favorable earnings estimate revisions from covering analysts.Since we recommend that investors select stocks carrying Zacks Rank of 1 (Strong Buy) or 2 (Buy) and Style Scores of A or B, it looks as if AutoZone fits the bill. Thus, it seems as though AutoZone shares could still be poised for more gains ahead.How Does AutoZone Stack Up to the Competition?Shares of AutoZone have been moving higher, and the company still appears to be a decent choice, but what about the rest of the industry? Some of its industry peers are also looking good, including Advance Auto Parts (AAP), Burlington Stores (BURL), and Stamps.com (STMP), all of which currently have a Zacks Rank of at least #2 and a VGM Score of at least B, making them well-rounded choices.The Zacks Industry Rank is in the top 5% of all the industries we have in our universe, so it looks like there are some nice tailwinds for AutoZone, even beyond its own solid fundamental situation.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report AutoZone, Inc. (AZO): Free Stock Analysis Report Stamps.com Inc. (STMP): Free Stock Analysis Report Advance Auto Parts, Inc. (AAP): Free Stock Analysis Report Burlington Stores, Inc. (BURL): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research