Ok, not sure if anyone cares or not but we just got back from our trip.
I worked all day Saturday, using my phone a couple of times to text my gf. Nothing more than that. When I left work (8 hours later) my phone was at 70%. I thought that was a little crazy. By the time I used it for the rest of the night (not much since I drove 2 hours down south and pretty much started drinking with friends when we got to our destination), my phone was at 30%. I called one friend otherwise it sat upstairs on a side table.
My gf didn't charge hers at all that night and this morning she still had 60%. And she used her phone a lot more than I did mine. She even ran podcasts as we drove in the car.
I put task killer back onto my phone this morning after a full charge and have used it today for the market, downloading ringtones, texting, youtube, browser, etc...and it STILL is reading 90%. Now that's what I was looking for!!!
Not sure if it has anything to do with task killer or not but that's the comparison I am seeing between hers and mine...if it helps anyone