Formula to convert 2.1 liters to gallons is to multiply 2.1 by 0.264172 (this is the value for 1 liter to gallon).
Convert 2.1 Liters to Gallons results
2.1 x 0.264172052 = 0.55476131004
2.1 l = 0.55 gal
To conclude the answer for 2.1 liters is zero point fifty five gallons