Here's my brand new custom designed tour bike with a SA XL-RD5w with 117 GI that day I think. Near 46 mph with about 12 mph tailwind. It was the maiden highway ride as well for the bike before I did all the CF addons, but the wheels had done 44.63 twice on a 1991 Raleigh frame that I had bought new.
VIDEO proof, skip to 50 secs, and at 2:47 I show the speedometer. The setup was a big mess then just to get it on the road and try it.