0526 GMT - Sharply higher U.S. Treasury yields in September--at levels unseen for decades--reflect market expectations for still sticky inflation stemming from elevated energy costs, JoAnne Bianco, senior investment strategist at BondBloxx Investment Management, says in a note. "The 'higher for longer' rate environment has become 'much higher for a lot longer'," she says. Economic data continue to point to a resilient economy, as evidenced by Wednesday's revision to second-quarter GDP growth to 2.2% from the previously reported 1.5%, she says. Lower-than-expected PCE data, the Federal Reserve's favored inflation gauge, for August, has done little to bring yields down, as investors remain focused on inflation, fiscal deficit, Treasury supply and term premium, Bianco says.