Looking through my stats from last night, adsense RPM quadrupled for a few hours yesterday giving our site 4 times our usual revenue.
Having looked at the stats it seems the following options are the highest paying in terms of RPM for our site:
Text based,
Interest based
all bid types apart from active view CPM
I can easily switch an ad unit to text based to see what happens. I can also keep interest based ads running. But is there any way to opt-out of context based ads? I noticed that this had some of the lowest paying RPM rates of all of them.