IE works in background to allow video playing under lock screen, could help to stop the background task if not using this specific functionnality. For me, IE was on top of the list until I close all the tabs. I'm experiencing now the tabs things to be sure.
But this list doesn't show if the drain is ok or not, it just lists the app putting the most demanding on first.
Edit: nothing wrong with tabs, stil have 10 tabs open for 2 hours and IE doesn't pop on top of the list. It just did cause I use it yesterday but no other app, so it appears first with a big diagram bar.
I had some battery "issue" but that was in fact the use of online games that burned the battery at 70% / hour rate. It's not the problem here, and in my case, I just stopped that kind of game. Before 8.1, the night, so, without use, with 4G, bluetooth, GPS and glance on (wifi and double tap off), I had a 0.8%/hour rate drain. Now with 8.1 it increases to 1.2%/hour (but my gmail account was checking at the reception, I have to check now with 2h check as before).
I don't think the problem is from the 920, but from your 920 that is defective =/