Formula to convert 13.8 liters to gallons is to multiply 13.8 by 0.264172 (this is the value for 1 liter to gallon).
Convert 13.8 Liters to Gallons results
13.8 x 0.264172052 = 3.64557432312
13.8 l = 3.65 gal
To conclude the answer for 13.8 liters is three point sixty five gallons