Originally Posted by
Black Pudding
The whole point of working out calculated and comparing to actual is that you are taking the opportunity to use fuel providers calibrated metres to make sure your aircraft gauges are reading correctly. .
This ^^^^^^^
Required fuel - Fuel on board = Required uplift weight.
After refuelling; volume delivered (from refuellers receipt) x SG = uplift weight
uplift weight / required uplift weight = discrepancy. (1.03 = + 3%)
Different operators have different procedures but the result is the same. (the important bit is the ratio of actual uplift to calculated uplift)