Bought a Hybrid in July, my clock started Oct 4.
Patiently waiting for the free 22 serial number, I decided to call about 3 weeks ago.
First off it feels like they don't even answer the phones anymore. Finally left a message after a couple days of no phone answer. Got a call back and that started a two week chain of emails, as I found out they didn't even have me registered for the promo. They asked for a copy of the receipt three times, in which I wrote back, "I'll re-forward you the email I already sent."
Then they said, sorry you didn't register in time, to which I replied, "no, here's the email I sent, note the timestamp with then promo period. Kick me up another notch, as this answer is unacceptable."
Then I got a form letter which said I am now registered, and I'm still nervous that it was just a generic letter, and nothing has happened on their end.
They dropped a major ball on this one.