Recent gasoline price surges, up sharply amid Middle East supply pressures and seasonal factors, stand as the dominant driver behind market-implied odds clustering on 0.5% or 0.6% month-over-month headline CPI for September. August's 0.4% print and 0.3% core increase set a firm base, with forecasters anticipating energy contributions to lift the headline while core ex-food-and-energy moderates toward 0.2% on softer used autos, subdued rents, and limited goods pass-through. Trader consensus reflects uncertainty over rounding effects, airfares, and shelter components ahead of the October 14 BLS release. Recent New York Fed survey data showing elevated one-year inflation expectations at 3.9% further supports the balanced pricing between the two leading outcomes.