Quick questions about reward flights

Hi all, just have a few questions I am hoping someone can answer for me...

1. If I book a reward flight (return) using miles in say PE but UC later becomes available, will they let me just pay the extra miles to upgrade?
2. Do you earn tier points and miles on reward flights?

[Neil]

1) Yes, you will be able to upgrade further with more miles.
2) No, if it is a ticket just 'paid' for with miles, then you don't earn any TP or miles. If it is an miles upgrade from an economy or PE fare to a higher cabin reward seat, then you earn TP and miles based on the original cash fare.

Neil