I have been flying for airlines, some big and some quite small, for over twenty years. Fuel policies, overall, are fairly similar; fuel to destination + 5% ( used to be 10%)+ full missed + alternate + 30 minutes. Having said that and to add to some previous posts, I recently chose to carry extra because with local knowledge I was doubtful of the weather forecasts at the time. Within days I was called in and asked to justify myself.
For me that was a first. Needless to say, I was not impressed.
To satisfy the curiosity it is in S.E. Asia.