I flipped my thermostat this weekend on my 2015 with 60,000 miles. I thought I would be cute, and do it in place instead of taking it all the way out. Don't bother... It still only took about 20 minutes. I had been watching my temperature for the previous 3 weeks and the results are in. 185°F before, 147°F after the flip with the same outside air temperature, same roads. Well worth the effort.