Recent September CPI data, which printed at 3.7% year-over-year—above consensus of 3.6%—has anchored trader expectations for the October reading, with gasoline prices surging 9.1% monthly amid the ongoing Iran conflict accounting for more than half the headline gain. Core CPI rose 0.3% to 2.6% annually, exceeding forecasts and reflecting persistent shelter costs plus tariff and AI-related pressures on goods. These factors, combined with elevated energy benchmarks and limited near-term relief in supply chains, have concentrated market-implied odds on 3.7% as the mode while leaving modest room for variance around 3.8-3.9%. The October CPI release on November 10 will incorporate any further energy volatility or labor-market softening ahead of the late-October FOMC meeting.