I have observed (without taking any precise measurements, so put this in the FWIW category) that the battery life on my jailbroken KV, leaving WiFi/3G on all the time (I like to sync with my phone, as I switch back and forth all the time), appears to be significantly better on 5.7.4. I can go a week or so now without charging, whereas previously, it seems to me that I was in danger of running out of juice every 2 to 3 days. Did they fix some WiFi sleep issue? Who knows? YMMV.
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