To convert liters to milliliters, you can use the conversion factor that 1 liter is equal to 1,000 milliliters.
So, to convert 40.6 liters to milliliters:
\[ 40.6 , \text{liters} \times 1,000 , \text{milliliters/liter} = 40,600 , \text{milliliters} \]
Therefore, 40.6 liters is equal to 40,600 milliliters.