Hi. I don't know if I'm the only one to have had this happen, but in the race today my fuel calculator told me that on my next stop my driver would have fuel for 10 laps (this is the last stint) but after the pitstop my driver only had 7 or 8 laps of fuel. I then went back to the strategy tab in the raceviewer and noticed that it once again said 10 laps of fuel. I then changed the amount of fuel by 1 litre and it changed from 10 laps to 7.
If this turns out to be a bug in the game I would very much like to have it be fixed.