Recent hotter-than-expected September core CPI at 0.3% MoM—versus 0.2% consensus—has left trader sentiment finely balanced for October’s reading, with 0.2% and 0.3% each implied at 36.5%. Surging energy prices, particularly a 9.1% gasoline jump tied to geopolitical tensions, spilled into broader services and shelter costs, lifting the core annual rate to 2.6%. This outcome has reinforced expectations for additional Fed tightening, with December hike odds now near 90%. October data will test whether momentum persists or moderates ahead of the October 27–28 FOMC meeting and the November 10 release, as markets weigh shelter trends, goods deflation offsets, and any further pass-through from commodities.