So, are petrol stations open on Christmas Day? Yes, but only the brave ones. The ones staffed by caffeine-fueled angels. The ones that cater to forgetful families and rogue road trips.
Your best bet is a motorway service area or a huge chain near a city. Your worst bet is anything that looks like a “family-run shed.” That shed is definitely closed. The owners are eating turkey, like decent humans.
Next time someone asks this question, smirk. You now know the secrets. You know about the batteries, the sad sandwich, and the Christmas ice cream. You are a petrol station oracle. Go forth. Drive safe. And maybe fill up on December 24th—just to be safe.