Ben Delaney had a recent YouTube episode where he was in the wind tunnel with Silca. He switched from 46cm to 42cm bars, and it was around 16 watts saved at 20 mph. Switching from shallow to deeper wheels was an 8 watt savings.
Full video is here, the results start at the 15 minute mark:
https://youtu.be/AU9V-RCRmsY?si=QT6NPrriaUYfQO0T