I noticed a slight improvement, but it think the real issue that may be plagueing a lot of nexus 4 users is permissions managment of apps. I noticed that after i downloaded the permissions manger app that is simply a way to access the new 4.3 application manager that has not been opened yet, i was able to shut down a boat load of apps like USPS and others that want constant location information and access to my phone records and sms records etc...there are a lot of apps that dont need most of these permissions, and this new app allows you to turn off or keep on just the essentials. So that has helped tremendously. I then bought the ZeroLEmon Juicer battery case and mated my nexus 4 with it, this over doubles your battery life because it is adding a second battery in series to your integrated battery. Most people dont like it because it is so huge, double the thickness and a little added length. I put a review on amazon with details, but got 27 hours of moderate use on the two with jellybean 4.3 update...