My oldest daughter got her license two weeks ago yesterday. I let her drop me off at my house and then she took my Nissan Sentra home to her Moms home 20 miles away through LA Friday evening commute traffic! (She was able to talk me into this for the same reason you let your's take the Z I'm sure.) I was an absolute wreck until she called and told me she was home!! I wasn't concerned about the Sentra! I can only imagine your suffering about her AND the Z!