US consumer price inflation accelerated to 3.7% in September from 3.4% in August, overshooting the 3.6% economists expected. Core CPI rose to 2.6% from 2.4%, also above forecast. Gold fell roughly $40 within minutes of the release to $4,129.60 an ounce and silver dropped $1 to $58.07.Gasoline Did Most of the DamageThe 1.1 point gap between headline inflation at 3.7% and core at 2.6% is the whole explanation.Average US regular gasoline rose 7.3% over the month, from $4.058 to $4.355 a gallon, on EIA data. Energy is excluded from the core measure, so a fuel spike lands entirely in the headline number and leaves core largely untouched.That makes this a supply-driven print rather than evidence of broad price pressure — a distinction central banks weigh heavily, because monetary policy does little about the price of crude.Core Didn’t Accelerate, It Failed to SlowCore CPI came in at 0.3% month over month against the 0.2% expected, and the framing matters.August core was also 0.3%. Forecasters were looking for a step down that didn’t arrive, so the beat reflects stalled progress rather than a fresh acceleration. Underlying inflation is running at the same monthly pace it did last month, which annualises to roughly 3.7%.Headline monthly inflation did accelerate, to 0.6% from 0.4%, consistent with the fuel move.Metals Sold Off on the Rate ReadGold and silver both fell, which is the mechanical response rather than a surprise.Hot inflation pushes expected rate cuts further out. Later cuts mean higher real yields for longer, and higher real yields raise the opportunity cost of holding assets that generate no income. Gold and silver are the clearest examples, so they take the hit first.A stronger dollar on the same logic compounds it, since both metals are priced in dollars.The Fed Watches a Different GaugeCPI moves markets, but the Federal Reserve’s stated target is the PCE price index, which weights healthcare and housing differently and has been running cooler.August PCE came in softer than forecast, and policymakers have leaned dovish in recent remarks. A hot CPI driven by gasoline sits awkwardly against that, and it is unlikely to settle the next decision on its own.The signal to watch is whether the core monthly pace breaks below 0.3%. Until it does, the case for cuts rests on labour market weakness rather than on inflation returning to target.