Formula to convert 31.8 liters to gallons is to multiply 31.8 by 0.264172 (this is the value for 1 liter to gallon).
Convert 31.8 Liters to Gallons results
31.8 x 0.264172052 = 8.40067126632
31.8 l = 8.4 gal
To conclude the answer for 31.8 liters is eight point four gallons