I have a TCH in Toronto, purchased NO '06. Now that I have driven it almost to the end of the month of May, I can make a comparison. Perhaps you have not had too many responses, because there was nothing for many TCH owners to compare winter driving with. Now that I have driven it in both winter and spring, I can say that the mileage is slightly better in warmer weather. On my current tank, I am getting 5.9 l/100 km. combined city/highway, whereas when I was driving it at -15C or - 20C, I was getting more like 6.4 or 6.5 l/100 km. I think another factor is that when I was driving on very icy or snowy roads, the mileage was also compromised.