I never thought to use the washer fluid. Like I said , winter caught me with my pants down. I will give that a try next time. I try to NOT use any heat ( including front electric defrost ) until I get on the highway which is about eight miles from home. During that eight miles today , it took three miles to get the engine to the temperature where it will shut off consistently (about 154 F). Then next five miles just barely kept it at that level. Lots of glides. It's not until I merge onto the highway ( using a whopping 2000 RPM ) that the coolant temp reaches 190. Today , 40.5 deg F , wind W14. 35.0 miles , 61.19 MPG. Tank is at 331.5 miles , 60.73 MPG. I did put in one piece of pipe insulation yesterday. I'll see if I can find some more when I get home tonight.