When fuel says it has 1 lap left and there is 1 lap left in the race, you should not be out if the race. It should last just long enough
I presume you do finish and then get excluded in scrutineering because you donor have enough fuel left for a sample.
Good pickup. At the moment the number is being rounded to the next whole number, so if you have 0.8 laps of fuel left it's showing as 1 lap - I'll fix this.