The cold is a killer. Didn't have to do much driving this weekend but what I did was very short trips (.5 - 1.5 miles) and -20 to -25*F temp. (windchill -30 to -40) Even plugging in, Just couldn't get it the car to warm up. I didn't even record trip mileage, suffice it to say it was REALLY BAD. They say windchill doesn't affect vehicles. Technically I suppose I agree, but practically I don't. The wind takes what little heat is available and sucks it away so it can't warm up. Filled up yesterday. 44.2 mpg - 645.3 miles. Not too bad considering. Lost a bit with these last couple of cold weeks. Avg. mileage for the year was 45.4 mpg - 72.78 gallons (275.5 L) Happy New Year to you all!!