I am using the fuel planner in advanced mode. copying all details for weather, FL PAX numbers etc into the planner and generating the load sheet. And twice now I'm running out of fuel before I reach my destination in the A318. I have a tail wind, using a cost index of 30. flying in managed mode Is the fuel planner wrong ? or could I be doing something wrong? I have been flying some segments of my journey at x4, could that cause fuel burn issues?