My car's fuel economy seems to take quite a plunge. I know that is common during the winter to lose 1 or 2mpg but I think it's more like 6 or 7mpg for me. Could that be accounted for in that I start it in morning about 10 minutes before I leave to warm it up and defrost the windows (although the defrost doesn't work worth a damn and I gotta scrape it all anyway!).
