No, phone idle has never used more battery than display. So I guess that's good. Lol. I've noticed lately tho, that if I turn data on, I can literally watch my battery percentage drop. I've calibrated. And completely drained and then charged (uninterrupted) the battery.
I like cm7 though. Has lots of really cool features, but my main purpose for getting it was better battery life. ( which wasn't bad on stock) again, any and all input is welcome!