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      11-12-2011, 03:00 AM   #3
swamp2
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Drives: E92 M3
Join Date: Sep 2006
Location: San Diego, CA USA

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Colder the better and higher density typically goes along with colder temperatures. Of course the cold starts are not good on an engine (nor batteries, belts, and a slew of other car things) at all but if the question is purely about power then colder the better. Growing up in Alaska the coldest parts of the winter (-40 to -50 deg F) made for some serious bumps in power.