I was given a car that did not have a Sunpass in it. I asked and was told that the car was registered and I would be billed by the license plate.

I actually bought a Sunpass and when I went to activate it, it didn't activate.
Very important, there was a message that it would take hours for the Sunpass to be active.

I ended up not using the Sunpass and just did the toll by plate.

Also for Sunpass, you have to add the license plate to the account, then remember to remove it when the rental is done. The $5.00 Sunpass will be destroyed when you remove it from the car.

Quite a bit of hassle to save a few bucks. Now if I was going to be in Florida longer...