Formula to convert 12.5 liters to gallons is to multiply 12.5 by 0.264172 (this is the value for 1 liter to gallon).
Convert 12.5 Liters to Gallons results
12.5 x 0.264172052 = 3.302150655
12.5 l = 3.3 gal
To conclude the answer for 12.5 liters is three point three gallons