Borrowers who refinanced during the three-month period ending Sept. 30 will save approximately $6.0 billion in interest over the next 12 months, Freddie Mac said in its third-quarter refinance report Tuesday. The GSE’s refi report – which is compiled from data on sample properties in which Freddie has funded two successive conventional, first-mortgage loans, with the second being a refinancing – found that 37 percent of refi borrowers shortened their loan term. This was up 5 percent from the previous quarter and the highest since 1992, the report said.