You will see more bore wear with a cooler t-stat, less heat, less MPG and barely any more HP, the gain from denser air is somewhat offset by thicker oil among other things and the gain ends up very tiny. I live in montana and love me a 205* t-stat !
I'm convinced the 195 t-stat is just fine, I live in Idaho, I like my heater in the winter.
I notice your from kalispell hotroddave, I used to live in Missoula, kalispell is a beautiful town. I live in Idaho now. I'm only 140 miles from Missoula though.
