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Back on topic, last night I made a very clear observation of just how much winter impacts mpg, even without idling, snow, or other drivers. I was coming up the canyon in a section I always have to use WOT for about 20 seconds or I'm forced to downshift out of 6th gear. This entire tank, at 50mph I've been showing 19.1-19.5mpg in this section. However, it's been relatively warm and I climb that stretch fairly early in the evening on my commute. Last night, same stretch, same speed, I was at 18.1-18.2mpg because the air was so cold. The engine was at 213F water temperature (the engine is really working in this section and that's pretty much the hottest it ever gets, anywhere in my drive), air intake temperature was 40F and when I got home, outside air temp was 24.8F. Guess I need to work on a warm air intake... I always figured mpg was mostly lost to cold starts and road conditions.
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