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Here in Germany it does not make a difference at all, if wireless is on or off.
I tried it now over 2 nights and in fact it used less power, when wifi was on! Both nights I had it in flight mode: on
First night it used within exactly 9 hours 3% of battery life this night with wifi and flight mode on it used wihin 10 hours only 2%.
The thing that kills battery life is the touchscreen. Use that only if you have to and keep it the rest of the time off.
I did several tests during the last 4 days and the touch screen is realy draining the battery life.
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