In Reply to: depends posted by crowboy on Wednesday, 6. April 2011 at 23:07 Bali Time:
website. Go into the Frequent Flyer area and look up award miles.
For Perth - Denpasar you will see the award varies from 2805 miles for Platinum flying Business to 401 for Blue flying some Economy promotional fares. You probably flew on two different fare levels for your trip.
You can also go into your FF account on the website and send an email with your question and the answer will be back within a day.