The reported decrease in both earnings per share and sales for AutoNation is likely to negatively impact investor sentiment and could lead to a short-term decrease in stock price. The significant drop in EPS, by 28.62%, and the decrease in sales, by 5.88%, compared to the same period last year, are critical factors that investors will consider. These figures suggest a downturn in the company's financial performance, which could lead to bearish market behavior towards AutoNation's stock in the short term.