Battery stat is most affected by apps that keep wakelocks, preventing the CPu going into deep sleep mode (usually when screen is off, use CPU Spy app to see). Normal idle during screen on, the CPU is at the min frequency, which I believe 800 is too high, When it's actually processing info, it ramps up to max frequency, how fast depends on the governor, conservative has slow ramp up time. Interactive/X/smartass/v2 has faster ramp up time, sacrificing little in battery.
I've achieved 11 days on a charge with my OV using CM7 (turning off 3g, wifi, BT, GPS unless needed), also airplane mode during sleep. Now I've only had my MT for a couple of days (heavy use so far since I'm playing with it all the time, but I can probably easily stretch it to 3-4 days. I'll post more definite results in a week or so.