Quote Originally Posted by frdyam400 View Post
yea a 180 thermostat is not going to bother that cuz once your car warms up the pcm goes out of closed fuel loop into open fuel loop
Obviously you don't understand how a thermostat works.

A 180* thermostat will make the car run cooler than a 195* thermostat so the car never "warms up" to operating temp and will therefor affect MPG because the ECU is being told to dump more fuel.