Fuel Algorithm Off?

[Rex Seattle]

21 laps to go, got fuel, entered last lap in 1st place, ran out of fuel on the backstretch, coasted across in 11th.

Indy oval in the Dallara IR-18.

I have 'base fuel calculations on max fuel consumption' checked, and add an additional half lap of fuel to finish the race. Most of the first 29 laps were run in clean air, so fuel consumption/lap should have been higher then, and I had no damage. I suppose it's possible that the temperature or wind speed changed, but I heard of this happen to another person as well.

It was what I would consider a very "routine" race, with nothing unusual occurring. We had 5 yelllows in the first half, 2 yellows in 2nd half of the 50-lap race.

Is it possible that the fuel algorithm is off on the IndyCar, or doesn't account for some other routine factor or jitter?

I guess the obvious answer is to add an extra 10 laps of fuel on refuels just to be safe.

This is all just FYI. In case you get more reports and notice a pattern.

Even though it cost me a win, I still love the program and appreciate the fact that you give it to us. Thank you.