Formula to convert 30.9 liters to gallons is to multiply 30.9 by 0.264172 (this is the value for 1 liter to gallon).
Convert 30.9 Liters to Gallons results
30.9 x 0.264172052 = 8.16291641916
30.9 l = 8.16 gal
To conclude the answer for 30.9 liters is eight point sixteen gallons