x2.36; apn for 2min every 30min, leave apn enabled while>10kb/30s, keep apn disabled while battery's below 15%, leave apn enabled while screen on
i charge my battery overnight and on a moderate use it lasts me about a day and a half.
also, i leave 3g on as described above during the day and when i'm out because it's just an extra step of hassle to turn on and off every time i wanna use data. but when i'm home i just use juice defender's apn toggle widget to turn it off