Formula to convert 15.1 liters to gallons is to multiply 15.1 by 0.264172 (this is the value for 1 liter to gallon).
Convert 15.1 Liters to Gallons results
15.1 x 0.264172052 = 3.98899799124
15.1 l = 3.99 gal
To conclude the answer for 15.1 liters is three point ninety nine gallons