make a new entry for fuel in the tank “refuel”
the point is that if we pour fuel into the tank and REALDASH fixes the difference, a sharp increase in the fuel level, say more than 5 liters,
then the difference is displayed by which the amount of fuel has increased.
useful when refueling
Perhaps you missed or did not understand the request? 
I had trouble understanding its use-case and thus needed time to think about it.