As nitpicker has said.
I would normally:
Decide the total block fuel for Sector 2. Add 100kg to be sure you have this on stand. It should cover your APU as well.
Add the TAXI + TRIP from Sector 1, adjusted slightly to account for the extra burn per hour and realistic enough to make sure you don't eat in to your Sector 2 block fuel.
Check your TOW is acceptable.
Edit: for an A320!
Last edited by The African Dude; 1st Oct 2012 at 07:23.