im running a 160 stat with a new 3row, with a electric fan, its running 160-180 its right at 17mpg, i would much rather run it cool, less heat anytime for me., my trans am ran much better with a 160 stat., i never noticed any change in mpg, but seemed to run better.,i have heard many people that want to run the 180, the stat that was in the car was a 195, it ran to hot for me, and i would swear it seemed sluggish when it was up their....