Formula to convert 15.8 liters to gallons is to multiply 15.8 by 0.264172 (this is the value for 1 liter to gallon).
Convert 15.8 Liters to Gallons results
15.8 x 0.264172052 = 4.17391842792
15.8 l = 4.17 gal
To conclude the answer for 15.8 liters is four point seventeen gallons