Re: FUEL modes in races

the fuel mix is locked since 2021, just like the real life, except when the safety car or virtual safety car is out

Yes they can. With all the settings they use in the race, they have a limit of a maximum fuel that may be used per hour. And per GP. When you listen to the board radio's, there are alot of messages where the engineer gives a message to adjust settings to get more performance (fuel , ers etc). 

@Raymond-Smitsin 2020, a rule change came into effect (Technical Directive 37) that meant each F1 car had to run the same engine mode (primarily affecting the internal combustion component of the power unit) from the start of qualifying to the end of the race. Party mode as ended...

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, drivers used to be able to change their fuel mixtures from lean (less power) to rich (more power) during the race, usually by adjusting engine mappings. However,the party mode ban in 2020, which limited what engine modes could be changed and when, meant that F1 drivers would no longer have much control over their fuel mixtures mid-race.

This means that now F1 drivers must run on one fuel mixture setup for the race (discounting safety car periods and changes for reliability reasons). This can lead to the driver having to lift and coast if the fuel mixture turned out to be a bit optimistic and the driver ends up using more fuel than expected."