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Larry,
I am not sure about that, only because I flew my P210 at FL230 at -40 ( C of F, your choice!) for 3 hours and had no problems. The P210 has no fuel heating either. I have read of dissolved water in fuel crystalizing out at very cold temps and clogging fuel systems though. That is why Cessna suggested Prist or Isopropyl Alcohol be added to the fuel if operations in very cold temps were anticipated. There were a few paragraphs about this in the P210 POH, as well as a graph showing how much Prist or Isopropyl Alcohol to add. The other Cessna P twins have oil heated fuel spiders I think.
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