Hey, first of all, I know running cool is a very common issue and has been posted about hundreds of times, however, I have just changed the coolant temp. sensor and the thermostat with genuine parts and there's no change. I can't find any info on the forum on what to do from here. Today I changed the 2 parts and thrashed the car up the road for about 20 minutes and it barely made it above 70. I then drove home in a more relaxed manner and the temp dropped below 70 again. I felt the thermostat housing with my hand after this and it felt warm, but a long way off how warm the other coolant hoses were. I currently get about 600 miles to a tank or about 38 MPG. Does anyone know what I can do from here?