Formula to convert 66.4 liters to gallons is to multiply 66.4 by 0.264172 (this is the value for 1 liter to gallon).
Convert 66.4 Liters to Gallons results
66.4 x 0.264172052 = 17.54102427936
66.4 l = 17.54 gal
To conclude the answer for 66.4 liters is seventeen point fifty four gallons