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U.S. stock futures slipped as oil prices extended their gains amid escalating Middle East supply concerns, with investors also awaiting fresh producer price index data and Oracle's earnings report. The combination of rising energy costs and looming economic data had added to market caution heading into the release. The August producer price index subsequently came in largely as expected, rising in line with consensus estimates, though underlying details showed firmer-than-anticipated price pressures in certain categories. The report added to a mixed inflation picture already shaped by hotter-than-expected consumer price data, keeping investors focused on how the data might influence the Federal Reserve's upcoming policy decision.