Battery life for iPhone4 after ios5 update

I updated my iPhone 4 to ios5 this week and the change in battery life is shocking. I've used my phone for an hour and 13 minutes straight since taking it off charge and it's burnt through 32% of my battery.
This week I've been reading all the tips to improve my battery but nothing has helped so far. I'm fed up, my phone is only 10 months old and the ios5 update is obviously a poor quality release (I'm a software project manager).
What can I do?  Are Apple looking into this issue? Has the cause been identified or is there a massive software vs hardware conflict with this release.
While typing this I e lost another 3% in 7 minutes.
Any hope appreciated.
Thanks

I totallly agree. Am iPhone 4 user and have been since its launch. Have had all previous versions and every iOS so pretty familiar with what constitues normal battery life on these things. I have a daily routine that sees an almost identical amount of email use, some wifi, some 3g, some location services every day. Since updrading to iOS5 last week I haven't been able to get through the day without flattening the battery. Have resorted to turning off everything I can think of - location services, bluetooth, wifi etc. Under my old regime these were always on. The phone is still not getting through the day. Based on hours usage I would estimate that the battery life has dropped by about 30%. Thats being generous. Looking at whats going on I suspect this is a sloppy release of iOS5 and I'll bet there'll be a quick update. One thing I would be interested to know is if you are syncing to Exchange because I have a sneaking suspicion this is wasting loads of cycles as I seem to now be seeing loads of minor changes to my calendar notifications that didn't used to hapen under the old iOS. Trouble is, if I turn that off I might as well go back to a pager!
All ideas gratefully received.

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