So I realized a simple trick to removing a locked gas cap from the filler neck without a key this morning. Thought I'd post it because I've heard people ask before but I've never come across this in any post...I couldn't actually find any of those posts when I did a quick search though. (mods feel free to move this post to one of them if you can find one and feel compelled)
A little background, I've had some trouble with water getting in my gas cap and freezing. Up until today it seamed to always happen to the lock mechanism itself not allowing the key to go all the way in and up until now this phenomenon only happened after I unlocked it.
Well, this morning when I went to remove it the lock mechanism was already frozen and I wasn't able to put the key all the way in. I quickly realized that the whole cap was frozen this time. I just turned it right off the filler neck like it was unlocked. Put it right back on when I was done with no problem. Checked it again a little later that day to make sure I wasn't crazy and had actually left it unlocked. Sure enough, it spun freely.
So, long story short if you find yourself with a gas cap stuck on a filler neck without a key, drench the cap, freeze it, and spin it off like its unlocked
Guess my locked cap isn't as secure as I thought.