Just a heads up to everyone here (maybe we can put it in the wiki as well?), if you use miles or voucher to upgrade, please check the number of miles you've earned after the flight. The system automatically issues the minimum number of miles (25%) even though you might have had the full economy class prior to the upgrade (you could have indeed earned 100%). This happened to me now 4 times in a row and I wanted to give a heads up.