Depending on track, and the availability of braking energy recovery, the amount of fuel required for fuel burning is around 10kg - 12kg.
Say that the energy density is 41MJ/kg, the ICE efficiency is 48%, and the extra energy required by fuel burning is 4MJ (ie 4.5MJ from braking/lift-and-coast).
Fuel energy required is 4MJ/48% = 8.3MJ.
8.3MJ/(41MJ/kg) = 0.2033kg/lap.
Most races fall in the 50-60 lap range.
Extra fuel:
50 * 0.2033 = 10.2kg
60 * 0.2033 = 12.2kg
There may be a balance point where recovering extra energy per lap (up to the maximum) costs more in lap time than the extra energy deployment gains.
With the slightly lower minimum weight, I expect that the lap times will be more sensative to extra weight than in the last rule set.
The 2025 rules did not have a race fuel maximum usage. And the 2026 rules also don't have this limit.
I'd suggest that 85-90kg is more likely than 100kg.
This is based on 3000MJ for the race (2014-2016 rules had 100kg/h and 100kg race fuel), fuel energy density near the maximum (41MJ/kg) and the above calculation for extra fuel required.
3000MJ/(41MJ/kg) = 73.2kg.
73.2kg + 10.2kg = 83.4kg
73.2kg + 12.2kg = 85.4kg
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