Harry Kanterman medal 5000 252 days ago
With no refuelling, you will set an amount of fuel to start the race with. The default amount is usually too many liters of fuel, and you will have to adjust it. You can find the amount of fuel you'll need by running a few practice laps and multiplying the fuel you use each lap by the total amount of laps in the race. Some managers use a spreadsheet to figure this out automatically, but the manual way works fine too.
Depending on the race, it's helpful to add or subtract fuel from the amount of fuel you think you need. For example, if you're running a race in really cold weather where you'll be pushing for a large percentage of the race, sometimes you need to add an extra liter or two to avoid running out.
The main thing is that whatever you choose to put in your car when setting up for the race, you can't change this during the race, so choose carefully!