[Fixup]

Check HCLM\Comm\commagr\planner, set cache time to be 600 (10min) and resume from suspend to be #777

Many custom ROMs set this value to 60 (1 min). This is a widespread miss info. A EVDO connection does not consume anything, only activity does. Frequent disconnect/connect do consume more. By default, this Gmail push service sends few bytes to the server every 9 min, virtually no impact on battery life. You may set Outlook to pick up headers only and 1 day only to consume even less battery and data usage.