Got my NAH on December 1st and just filled my tank for the first time. My MPG calculation came out at 29.8, which seems a bit low. The computer's estimate was 31.5. Since I've hardly driven the car this month when the temperature has been above freezing, I was wondering if the cold temperature is to blame for the somewhat dismal fuel economy, given that I've been driving the car rather wimpishly. Driving has been split 60/40 country (45-55 mph)/city (30 mph). Has anyone here made any comparisons of fuel economy between winter and summer driving? And what have you been getting for MPG?