I'm at 61 months on my 2012. Just tested it and still at full CCA.
On a side note, I just got 10 years out of a Optima red top in the Corvette And it didn't actually die I just replaced it for reliability reasons. It was only putting out half the CCA at the time.
The car produced in 2011 September. 28k miles, no problem with factory 70Amper battery. My sonic has Auto-stop feature also. When the car stop the engine stops. My friend has a 2015 Ford Focus with auto-stop feature. The battery changed 3 times under warranty and the Ford Service still not figured out why auto-stop feature doesn't work.