ok so i have tested all of these, the one that kills the battery the fastest is the auto sync feature, if you turn off wifi,bluetooth,gps,3g, all the auto sync features, location, you can get more then a days use of intense mp3,web,text,im,etc, but again as for your question, the auto sync i noticed drains mine in 3-4 hours comaped to a day with the rest off.
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