Sorry if this sounds awfully unprovencial or naive, but I've never rented a town car before--not even a taxi. So, if there is a 20% gratuity, is this 20% coming AND going? Or 20% total? What if you have different drivers? Do you pay all of it on the first leg? Or seven days later on the last leg? (I'm doing a Disney cruise--MCO to port and back). Or 10% going and 10% coming. I have absolutely no earthly idea.