I'm doubt. Mind to share your battery usage from Battery Saver app? Hopefully you are right because I'm about to buy a new phone due to the high battery consumption with my Lumia 920 using WP8.1 Developer Preview. I have replaced the battery with the original one from Nokia Center but still it doesn't improve the battery consumption. Talking about turning off things like GPS, background apps.. bla2.. please don't... I have done EVERYTHING..