Indeed ! It's clear from my user experience that constant Wifi use (aka video/music streaming, downloading files, cloud syncing) will further limit battery life.
I will try to watch an youtube video for an hour and see what is my battery discharge.
I have to run for an external meeting. But I was able to run the YouTube test for 33 minutes (HD video, full screen, 70% brightness, 50% speakers). Here are the results:
Start @3267 mAh - 78% - 8:56
End at @2944 - 70% - 9:29
After 33 min = 323 mAh = 587mAh per hour
7 ½ hour battery life implied if one would watch YouTube using 100% battery