Formula to convert 4.5 liters to gallons is to multiply 4.5 by 0.264172 (this is the value for 1 liter to gallon).
Convert 4.5 Liters to Gallons results
4.5 x 0.264172052 = 1.1887742358
4.5 l = 1.19 gal
To conclude the answer for 4.5 liters is one point nineteen gallons