Cold JetA temps . . .
I do not know about the Diesel 172, but I do know there is widespread use of Prist on small-medium turbine-powered aircraft when in cold temps.
The reason - as I understand it - is the JetA like almost all liquids will have some amount of absorbed water. This could even come from humidity.
When the tanks and their contents cool, the suspended water might seperate, and might freeze in some part of the fuel plumbing causing a blockage.