Recent September 2026 CPI data showed headline inflation rising 3.7% year-over-year and 0.6% month-over-month, driven primarily by a 9.1% surge in gasoline prices that pushed the energy index up 20.4% annually, while core CPI excluding food and energy advanced to 2.6%. This reacceleration from August levels has shifted market-implied odds higher for peaks above 4% in 2026, with traders pricing in renewed pressure on the Fed's 2% target amid persistent shelter and services components. The Federal Reserve's September 25-basis-point hike to the 3.75%-4.00% funds rate range, coupled with October 27-28 FOMC deliberations, underscores the policy response, as markets now assign roughly 37-50% odds to another move this month. The October CPI release on November 10 and subsequent data will clarify whether energy-driven momentum broadens or moderates toward year-end resolution.