Anita - know your problem was yesterday so you've probably already driven it home - but....seems to me you could pull the fuse for the TOD and eliminate that as a worry? I would have the same problem as you since I have that size tire as well - that was my plan if I ever had to run on the spare (pull the fuse). Also - somone mentioned putting the smaller tire on the front - I think I remember reading from someone here that was a definite no-no with the TOD (unless maybe you pulled the fuse?).

Anyway - let us know how it went for you with the spare - I may find myself in the same situation one day!