This is really unscientific... but let the battery drop below 93% via Advanced Power. Then reboot via the terminal. Your new level will be under 60%. This is after like 18 minutes of use from a fresh battery.

I've duplicated this twice since this morning. But the normal battery icon reports nearly full still. Seems like something broke in the battery sampling routine. But power seems to be about the same...

I'll still keep testing today though.