Elevated gasoline and energy prices are the dominant driver positioning a 0.6% month-over-month headline CPI increase as the leading outcome for September, with market-implied odds at 47.5% and a 0.5% print close behind at 34%. Consensus economist forecasts from Bloomberg and other surveys center on a 0.58% headline gain—up from August’s 0.4%—pushing the annual rate toward 3.7%, while core CPI (ex-food and energy) is expected to ease to 0.2% from 0.3% as shelter and services pressures moderate. Recent August data showed energy contributing over one-third of the monthly rise amid geopolitical supply concerns, and the upcoming October 14 BLS release will test whether these dynamics hold or if softer underlying trends emerge to shift probabilities.