Mighty Mira -- Where do you live, or more importantly, where do you drive your car? My location tells all, but I am interested to know where you are getting the mileage you are. If not Japan, I would guess Australia.
My commute is only about 17 miles long, so it is enough to get the car up to temp., but not long enough to appreciate the gains from running at said temp.
I always try to let fast drivers pass me by hugging the shoulder. I just wish that they would realize this and be safer about it.