Most crazy thing I've done this winter: took a large pot of coals from the woodstove and put under oil pan about 2hrs before starting. I didnt collect any data, but it seemed easier to start. I don't EOC when it is below 10 F, so there is just coasting in neutral. I also am more careful to keep speeds down. I like 47MPH in 5th gear, as opposed to 55mph in the summertime. I back into parking spaces, trying to face into the sun. Yeah, also what everyone else said about clearing everything off before starting. I keep the temperature dial at cold and the fan low or off for the first 5 minutes of driving, with the window cracked, if it will open. sometimes the door freezes and you have to climb in the passenger door. Pretty much winter is a pain in the a** so stay home if you can, and if you have the luxury, plan your trips around the weather.

somehow, I think because i have combined trips to the max and kept speeds low, i have kept the winter average above 40MPG.