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cold air & poor fuel economy
Good Morning,
Some ideas to chew on.
1) Cold air is dense. As it gets colder, density increases. Increased densisty means more oxygen can fit into the cylinder. This is the idea behind having an intercooler on your turbo. It'll cool the charge down and you can get more air in your cylinder that way.
2) Cold air is dense. The denser it is, the harder it is to move through. Ever wonder why the speed records are set at the salt flats in Utah? And not on the tundra of Alaska?
At -20 deg F, it takes quite a bit of energy to move through the dense air. Yes, your engine is slightly more powerful with the increased oxygen content. But also, remember, most vehicles coolant flowing through the throttle body to heat it so it won't freeze over.
~ryan
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Flatland2D 
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