I know many folks out there love these features and won't give it up for good battery life but I can tell you that if you turn background sync off and disable GMail push you battery life will skyrocket. During the course of a "normal" day I use about 70% of the battery life with push and sync enabled. When it's off I use about 10 - 15% in that same time period. For me it's well worth it. Just thought I'd give my .02 on this seemingly hot topic.