This suggestion couldn't make much less difference really.
They could invent a brand new unit, "Vlaardingens" for instance- your car can hold 85 Vlaardingens, you need 2 per lap, the race is 20 laps, you need at least 40 Vlaardingens to finish the race. The maths will always be the same, only the values will change, be it litres, percentage, gallons or Vlaardingens.