Gold slipped toward $4,150 an ounce on Thursday, giving up gains triggered by softer-than-expected August U.S. inflation data as elevated oil prices and Treasury yields weighed on the non-yielding metal. The PCE price index rose 0.3% month on month and 3.4% annually, below forecasts of 0.4% and 3.7%, while core PCE increased 0.2%, below the 0.3% estimate. Markets reduced the implied probability of an October Federal Reserve rate increase to about 38% from 51% before the release. Still, Treasury yields climbed to multidecade highs amid concerns that sustained energy costs could prolong inflation and require tighter monetary policy. Oil remained elevated as the United States and Iran showed little progress in negotiations despite signs of recovering Middle East flows.