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Now you see I noticed the opposite. Temperature had (until now) VERY LITTLE effect on my fuel economy even from dead summer to dead of winter (pre ethanol). I do not typically make a lot of short trips just a lot of LONG trips so the effect of longer "warmup" is greatly spread out for me.
FUEL had an effect not temperature (a noticeable effect)
In the cold climes they "alter" the fuel and this alteration is horrible for fuel economy.
I noticed when I took winter blend gasoline and REMOVED the ethanol from it (and other stuff that came out in the process) My fuel economy not only jumped massively but jumped beyond even my normal "summer" highs.
its why I was so surprised to see such a large increase and more than that other people seeing the same increase.
Now I do notice that with the METRO temperature has a much larger "impact" than with my previous larger rides (van jeep etc..) In fact so much so (thankfully minimal effect on me) the metro flat out WILL NOT WARM UP AT ALL in dead of winter unless I drive it. Just idling it can not produce enough "HEAT" to warm itself faster than the atmosphere cools it down :-)
I think a lot of people MISSED the full force effect of this weather for a simple reason. Dilution. I use a LOT of gas. even in a metro. I filled up 4-5 times during that "hot spell"
The average person would not even get through a one tank during that spell so they won't see the same "impact" we see filling up so often. (long commute)
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