Yes, I’ve heard this anecdote from a number of different folks over the years. 
Unfortunately, AFAIK none of these folks have produced any hard evidence to 
show that turning the screen curtain on actually increases battery life. I’d 
love to see a controlled and replicable study to either prove or disprove the 
assertions of those of us including Apple who believe there’s no difference in 
battery life with or without screen curtain.

Bryan

On May 10, 2014, at 10:33 AM, Glenn <glenner...@cableone.net> wrote:
> I exclusively use the screen curtain, and the battery life on my phone 
> exceeds expectation.
> I use the iPhone 5 with the latest update, and apps update automatically, 
> and my bluetooth and WIFI are always on.
> Glenn
> ----- Original Message ----- 
> From: "Bryan Jones" <openses...@me.com>
> To: "OS X & iOS Accessibility" <mac-access@mac-access.net>
> Sent: Saturday, May 10, 2014 9:27 AM
> Subject: Re: Screen curtain on iPhone
> 
> 
> Last I heard, the official word from Apple Accessibility was that the IOS 
> screen curtain has no effect on battery life. BTW, though I’ve done no 
> official testing, my personal experience leads me to believe this also holds 
> true for the MacOS screen curtain on Macbooks.
> 
> Bryan
> 
> On May 10, 2014, at 9:45 AM, Glenn <glenner...@cableone.net> wrote:
>> I would think that screen curtain being on would save more battery life, 
>> as
>> I'm sure that even when it is set to zero, display processes are still 
>> being
>> sent to the screen, and when screen curtain is on, I'm guessing that the
>> processes are not calculated by the processor.
>> Glenn
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