Formula to convert 6.3 liters to gallons is to multiply 6.3 by 0.264172 (this is the value for 1 liter to gallon).
Convert 6.3 Liters to Gallons results
6.3 x 0.264172052 = 1.66428393012
6.3 l = 1.66 gal
To conclude the answer for 6.3 liters is one point sixty six gallons