WOW @Doug Duthie you are a genius man, I would've never figure the in/out lap scenario out.That is to be expected....the more races you have, the less effect the one session with the high fuel usage will have.
In your case, the bad results were caused by you running laps with a high fuel load, then going into the garage and de-fuelling
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I discount fuel consumption where you refuel (this lap's fuel greater than last lap), but this scenario fools me into thinking that there is really high fuel consumption.
I guess I could discount In/Out laps from the calculation where the fuel load may have changed
thank you so much