Join Date: Oct 2009
Location: Northern/Central VA
Bikes: Specialized Sirrus, Univega Activa ST Hybrid, 70's Schwinn Traveler, Giant Innova, Nishiki Mixte
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Here is the flip side. Colder air is denser, it contains more oxegen per breath.
Personally, I seem to be able to make a faster pace at 40 degrees than 90 degrees.
Also the pressures in your tires will be lower at lower tempretures. So if you topped off at 90 degrees, and it is now 40 degrees, and there is no loss of air, you will have lower pressure.