2014 with approx 50k miles. Stock engine wise. I took a drive from San Antonio to D/FW to see family, and I drove it between 75-80 in 4-6 gears most of the time. I stopped to use the bathroom and when I started it up, it made a weird noise like a misfire type bang noise just when it starts. I got to the family home and let it cool overnight, but it still does it. Not sure if I should be worried.