"Peter" wrote in message ...
Hi All,

I fly a TB20 (avgas). The flight manual recommends various things but
does not give any ambient temperatures below which they should be
used.

The whole subject is a bit vague anyway, with stories circulating
about avtur additives being different from (or identical to) to the
avgas ones.

What would the experienced pilots here recommend, for an OAT down to
say -20C or -25C?

Peter.


Cold avgas should be no problem, assuming no suspended ice crystals.
Take care to keep your fuel clean and dry.
I often fly in the low flight levels where temperatures can be even lower.
The cold-soaked fuel flows just fine, including using a transfer pump to
move wing-locker fuel out into the tip tanks.
I've never had any avgas problems at those temperatures,
but cranking the starter against very cold oil has defeated me too many times.
Heated hangars are my favorite choice.