Formula to convert 15.6 liters to gallons is to multiply 15.6 by 0.264172 (this is the value for 1 liter to gallon).
Convert 15.6 Liters to Gallons results
15.6 x 0.264172052 = 4.12108401744
15.6 l = 4.12 gal
To conclude the answer for 15.6 liters is four point twelve gallons