I’ll fuel the conversation a bit. Switch to Columbus Tenax was in 1985. Looking at catalog specs from 1984 to 1985, componentry and wheels pretty much the same with only real difference to the Tempo being the change in tubing. What’s startling is the stated weight. 26lbs for the 1984 and 22lbs for the 1985.
I’m sure there’s not a 4lb difference in the frameset but it leads me to believe that Tenax is notably lighter than the mystery version of Champion tubing that was used in 1984. FWIW, my 1985 Tempo is 23.5 lbs. 58cm and built fairly light with Shimano 600 and Super Champion/Tipo wheelset.