My 2012 went to gas yesterday 3-4 miles into my trip while going up a hill on the freeway. No ERDTT message and it switched back to battery after a couple of miles and gave me 23 miles of electric with 6 left in the battery. It had gotten down to 30 the night before, but it was 44 at the time it switched over. I have been experiencing PPR messages at times for more than a year and a half, but this is the first time I experienced this. I assume I am getting closer to my 2012's end of life. I might have to start using mountain mode this winter.