Quote:
Originally Posted by CamaroFred
Hot air rises because it is less dense than cold air.
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This is true. I can't confirm what CamaroFred said in regards to why you're seeing lower gas mileage in colder weather (though what he said makes sense). Cold air is more dense. Cold air also means more air in your fuel/air mixture into the cylinder. That's why we like to install COOL Air intakes on these cars. Cool air = denser mixture = more power.