The nice case is adiabatic expansion, and at least the sign of the temperature change has the decency to behave the way one would expect:
https://en.m.wikipedia.org/wiki/Adiabatic_process
The more realistic case for a gas station is Joule-Thomson expansion, and it thoroughly defies basic intuition: https://en.m.wikipedia.org/wiki/Joule%E2%80%93Thomson_effect