Does anybody in here use I-PASS? I've got it mounted on my windshield where the instructions say to, but the only place it duducted tolls from was on the Skyway. I called and they said that since it was the first day I had it, maybe it wasn't fully working yet. However, when I activated it they said could use it right away. Just wodnering if there's a trick with our cars on getting this thing to work right...