This week it has been mighty cold throughout the nation!  Temperatures subzero in many places.  It made me curious as to whether or not anyone has ever had a problem with Avgas freezing (gelling)  in their Mooney?     According to what I read Avgas freezes at about -54 degrees F. Lately at my airport  it has been -10 at field elevation in the early morning.  Because of the mountains or clouds  I often have to fly 10,000 feet higher.   Lapse rates are about 3 degrees per 1000 (in high humidit