system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Is it actually helpful/necessary to have a full tank of gas in your car during freezing temperatures? If so why?

That’s it.
gpt
I believe the advice is in preparation for possible loss of power in a winter storm, whereby the gas pumps would not work, and also gives you plenty of reserve if stuck somewhere in the snow/ice and progress is very slow.