We were there the week between Christmas/New Years 2021/2022. It was $25 a day. We’ll be back there next month so, I’ll check for you to make sure it hasn’t gone up, and report back if you still need to know for a future time.
i hope it’s ok to add some commentary since I answered your question. We have always gotten a car when we go to Key West because we like the flexibility and we make some trips to Mangrove Mama’s which is at about MM 20. Love that place. It has good Key Lime Pie - not as good as mine but close.
Anyway, I think a car is a personal choice. Do you NEED a car in Key West? Not in today’s environment and as Scoop said, parking can be a pain. But, if you like the flexibility and don’t mind jockeying for parking then that’s ok, too.