For the last several days I'd noticed the auto idle stop not working. Regardless of the time of day I drove or type of driving I was doing it didn't work. I didn't have the A/C on at any time, and the temps had been in the 40's.

Well I read the owners manual and found out that if the car is in a defrost mode of any kind the idle stop will not work. In my case I had it set to warm the feet and the windshield, but I didn't have the A/C on. Once I switched to floor only the idle stop magically re-appeared.

This is different then the Prius and caught me off guard.

So FYI and read your owners manual!