Yeah, you'll be surprised what some people don't know. The person who returned the Impala from EWR at MIA as I was about to leave had no clue about the FL driveout special. All she knew was that she wanted to drive her daughter home to FL from NJ. So she picked up the car at the airport after flying in presumably because she didn't know about off-airport locations nearby, and got socked with $150/day. I asked the MIA agent about that, and he said that yes, they do get some off-peak like that.