Stopped at a gas station last night to fill up, and the fuel door would not open.
The release lever would not budge.
This morning I used a credit card to ensure no ice was inside the door itself, also used some hot water and was able to run the card around without issue.
At this point I think the release lever might be seized. Going to try picking up some jig a loo grease to see if that helps.
Any other ideas?