It was -12 deg this morning when I left the house for my run. I went 7 miles at an easy 8:32 AP. I had an impressive ice goatee and enough ice on my eyelashes that they kept sticking together. The sun had warmed things to a balmy -5 by the time I was finished. Something I find interesting. When running a high preformance snow mobile you have to change the jetting to get best preformance at high and low altitude to keep your air/fuel mixture from being too lean or rich because of the more dense oxygen at low altitude and thinner air up high. The same adjustments have to be made to compensate for high and low temperatures. If your machine is jetted to run well in sub zero temps it will be too rich and bogging down on those warm 50 to 60 deg afternoons in the spring because the cold air is more dense than the warm air. Why dosen't it feel like running at low altitude when running in very cold temps? In fact I think it feels harder. I have read things that say once you get below 40 deg you get slower the colder it gets. Hmmm.
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