If investors were wondering why Federal Reserve rhetoric remains so doggedly hawkish, the latest U.S. consumer price inflation report on Tuesday will likely explain why. According to consensus forecasts at least, U.S. headline inflation is expected to have retreated sharply again in October back toward midyear lows around 3.3%. But underlying 'core' inflation is expected to stay stickier at an unchanged annual rate of 4.1% last month and still more than twice the Fed's target.