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I had a little less than 9 GB available on my 64 GB iPad Air 2 and now have a little less than 11 available. So I gained about 2 GB.
 
1.5 GB on my iPhone 6s+. 2.0GB on my iPad Air 2.

Wow. You got to an extra 2 GB on your Air 2. I haven't applied the update to my Air 2 yet. But I will shortly. Perhaps it's the new Apple file system clearing way for more efficient storage and optimization for both the iPhone as well.

Thanks BigMcguire!
 
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I had 23 GBs available on my iPhone 7 plus before the update and I now have 29 GB left. On my air 2 I had 27 GB left before and now I have 35GB left.
 
Gained about 1.4 GB on my 16GB iPad mini 2. I think (not sure) I gain about 2GB on my 64GB iPhone 6.
 
Gained 2ish gigs on my iPhone 6s+ and not sure about my iPad Pro because I just got it a few days ago.
 
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