So, I'm given to understand that SEFI engines operate most efficiently at temps around 205-210. In an effort to get myself closer to that, I am running a 190 thermostat. My stupid engine never gets above 180-185. I have my fan set to come on at 205, and the thing hardly ever runs! I've also come to learn my understanding of how a thermostat affects your engine temp is a bit off in thinking it will run warmer than the thermostat open temp. Educate me, please.

Second problem. If I were to go to a higher temp thermostat, where would i get it? The highest temp one I can find is 197.