It took a while for the penny to drop; when I picked up the Dove it had 76.3lbs fuel, FSnav said the flight would need 43Ibs; so if I put in 119lbs then after the flight there should be roughly 76lbs left in it. However instead of typing in the total amount of fuel (119lbs) into the client I must have typed the amount needed for the flight (43lbs)

I'll be taking her back to EGSS later today; I'll just have to make sure I get the fuel right this time!