What degree Thermostat?

A friend of mine works at GM in the emission control section where years ago they did studies of mileage, emissions, and engine wear at various engine temps. The results showed that the mid 190's were the best for all three as a whole. (some areas were better at an even higher temp but it was deemed too high for reliablity reasons with the public thrashing them) 180 was about the same except for the emissions and 160 was worse for all three. Like I said, it's not a huge difference but when they were trying to squeeze every hydrocarbon in the emission battle, they did what worked the best to meet the new requirements. I'm sure if you searched the web, you could find other studies showing something similar. I'm not trying to convince you to change, I'm just stating what I know to be true. Follow it or not.....it won't change my life any and probably won't change yours either to any great degree.